TATONKA ENERGY INC
SC 13D, 1998-04-13
DRILLING OIL & GAS WELLS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                  -------------

                                  SCHEDULE 13-D

                    Under the Securities Exchange Act of 1934

                              TATONKA ENERGY, INC.
                                (Name of Issuer)

                          COMMON STOCK, $.001 PAR VALUE
                         (Title of Class of Securities)

                                    835758103
                                 (CUSIP Number)

                                George C. Barker.
                        9603 White Rock Trail, Suite 100
                               Dallas, Texas 75238
                                 (214) 340-9912
 (Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                 Communications)

                                 (April 3, 1998)
           (Date of Event which Requires the Filing of this Statement)


     If the filing  person has  previously  filed a statement on Schedule 13G to
report the acquisition  which is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

     NOTE: Six copies of this statement, including all exhibits, should be filed
with the  Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.








<PAGE>



                                  SCHEDULE 13-D

                               CUSIP NO. 835758103


1    Names of Reporting  Persons.  S.S. or I.R.S.  Identification  Nos. of Above
     Persons

         GEORGE C. BARKER                                     SS. No.  254660611

2    Check the Appropriate Box if a Member of a Group (a) [_] (b) [_]

3    SEC Use Only

4    Source of Funds          SC

5    Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d)
     or 2(e) [_]

6    Citizenship or Place of Organization

     USA

Number of Shares Beneficially Owned by Each Reporting Person With

7    SOLE VOTING POWER

     31,315,245

8    SHARED VOTING POWER

     8,768,268

9    SOLE DISPOSITIVE POWER

     31,315,245

10   SHARED DISPOSITIVE POWER

     8,768,268

11   Aggregate Amount Beneficially Owned by Each Reporting Person

     40,083,513

12   Check if the Aggregate Amount in Row (11) Excludes Certain Shares
     [-]

<PAGE>



         

13   Percent of Class Represented by Amount in Row (11)

     80.167%

14   Type of Reporting Person

     IN





















<PAGE>



Item 1. Security and Issuer.

     The title and class of equity securities to which this statement relates is
the Common  Stock,  $.001 par value (the  "Company  Common  Stock"),  of Tatonka
Energy,  Inc.,  an Oklahoma  corporation,(the  "Registrant").  The  Registrant's
principal  executive  offices are  located at 9603 White Rock  Trail,  Suite 100
Dallas, Texas 75238.

Item 2. Identity and Background.

     (a) - (f) This  statement  is being  filed by  George C.  Barker,  a United
States citizen who is a resident of Dallas, Texas, and whose business address is
9603 White Rock Trail,  Suite 100, Dallas,  Texas 75238. This statement is being
filed by Mr. Barker in his  individual  capacity and as Trustee of the Phy.Med.,
Inc. Employee Stock Ownership Trust.

     The  present  principal  occupation  or  employment  of George C. Barker is
serving  as the Chief  Executive  Officer  of a  company  engaged  directly  and
indirectly  in the  business  of owning and  operating  a center  that  provides
medical diagnostic imaging services to physicians in the greater Dallas area and
also managing an imaging center in Plano,  Texas, for other owners.  The centers
provide a full scope of medical  diagnostic  imaging services including magnetic
resonance imaging (MRI), computer axial tomography (CAT) scans, x-rays and other
radiological services to physicians.

     The name and address of the corporation with which such employment has been
conducted  since April 3, 1998, is Tatonka  Energy,  Inc. 9603 White Rock Trail,
Suite  100,  Dallas,  Texas  75238.  Prior to such  date,  such  employment  was
conducted  with Phy.Med.,  Inc. at such address.  On such date,  Phy.Med.,  Inc.
changed its name to PhyMed Diagnostic Imaging Center Dallas,  Inc. and became an
80% owned  subsidiary of Tatonka Energy,  Inc. The principal  business of PhyMed
Diagnostic Imaging Center Dallas,  Inc.  (formerly known as Phy.Med.,  Inc.) is,
and the principal business of Tatonka Energy, Inc. since such date has been, the
operation and management of medical diagnostic imaging centers.

     During the last five years  George C.  Barker has not been  convicted  in a
criminal proceeding (excluding traffic violations or similar  misdemeanors).  In
addition, during the last five years, George C. Barker has not been a party to a
civil proceeding of a judicial or administrative body of competent jurisdiction.

Item 3. Source and Amount of Funds or Other Consideration.

         See Item 5 below.

Item 4. Purpose of Transaction.

         (a)-(j)


                                        1


<PAGE>



   The Acquisition:

     Mr.  Barker  made the  acquisition  described  in Item 5 below to acquire a
controlling  equity  interest  in the  Registrant  and to  take  control  of the
management and direction of the Registrant,  including the changes in management
and the contemplated changes in business described below.

   Present and Proposed Changes in Management:

     The Directors of the Registrant at the time of the merger were Messrs.  Joe
Love and Joe Foor, who are continuing as Directors.  In addition, at the time of
the  merger,  George C.  Barker  was  elected to the Board of  Directors  of the
Registrant to fill a vacancy which existed on the Board of Directors.

     At the next  annual  meeting of  stockholders  to be held in May 1998,  (or
consents  in lieu of such a  meeting),  Messrs.  Barker,  Love and Foor  will be
re-elected  for the coming year and two  additional  Directors  will be elected:
Marilyn  Moss and Judith F.  Barker.  George C.  Barker and Judith F. Barker are
married.

     In addition,  at the time of the merger,  George C. Barker was also elected
Chairman of the Board,  President  and Chief  Executive  Officer,  and Judith F.
Barker was elected  Secretary and Treasurer of the Registrant.  Joe Foor and Joe
Love resigned as President and Secretary of the  Registrant so that Mr. and Mrs.
Barker could be elected to their present  positions.  In addition,  Marilyn Moss
was elected Executive Vice President - Operations.

     At the annual  meeting of the Board of Directors to be held  following  the
annual  meeting of  stockholders  (or  consents  in lieu of such  meeting),  the
following officers will be re-elected for the coming year:

        George C. Barker                   Chairman of the Board, President
                                           and Chief Executive Officer

        Marilyn Moss                       Executive Vice President - Operations

        Judith F. Barker                   Secretary and Treasurer

     The corporate  offices of the Registrant  have been moved to the offices of
PhyMed and are now located at 9603 White Rock Trail,  Suite 100,  Dallas,  Texas
75238.

     Contemplated Changes in PhyMed's and the Registrant's Business:

     PhyMed is a seven-year-old  company engaged in the operation and management
of medical  diagnostic  imaging  centers,  which provide a full scope of medical
diagnostic imaging services including magnetic resonance imaging (MRI), computer
axial tomography (CAT) scans, x-rays and 

                                        2

<PAGE>

other radiological services to physicians.

     Prior to the  acquisition,  PhyMed  was a  privately-held  company  and the
transaction  with PhyMed was undertaken as part of an overall plan for expanding
the business of PhyMed through, among other possible endeavors,  the development
of new  centers,  acquisitions  of  existing  centers  and  exclusive  capitated
services  contracts,  with a view towards  increasing the per-share value of the
Registrant for the benefit of the shareholders.

     This expansion will require additional capital,  and the managements of the
Registrant  and PhyMed  believe  that  raising  additional  capital  can best be
achieved  through PhyMed having access to the public  shareholders and reporting
company status under the Securities  Exchange Act of 1934,  which the Registrant
affords. The principle followed in determining the amount of consideration to be
exchanged  by the  Registrant  for  PhyMed was the  percentage  of the equity of
PhyMed the owners of PhyMed would cede in order to gain such access and have the
opportunity to raise such capital.

     In  furtherance of this goal of raising  additional  capital for expansion,
the  Registrant  has  recently  commenced a private  offering of  securities  to
accredited investors only. The offering seeks to raise a minimum of $200,000 and
a maximum  of  $3,000,000  from the sale of Units of a new  series of  Preferred
Stock and Warrants to purchase Common Stock.

     Operation of Outpatient Radiological Diagnostic Centers.  Currently, PhyMed
owns and  operates a  diagnostic  imaging  center in Dallas,  Texas.  The Center
provides  diagnostic  services to physicians in the greater Dallas area. It also
manages  an  imaging  center in Plano,  Texas for other  owners.  The  Center is
located at 9603 White Rock Trail,  Suite 100 in Dallas.  The  Center's  services
include magnetic  resonance imaging (MRI),  computerized axial tomography (CAT),
fluoroscopy,  radiology,  invasive procedures,  pain management,  ultrasound and
mammography. The Center is well known for its quality of service to patients and
referring physicians.

     The Registrant has plans to expand  PhyMed's  operations in the Dallas/Fort
Worth market and other targeted markets in the immediate future. Discussions are
being held with other parties on the acquisition of existing centers.  Locations
for new centers have been identified and negotiations on leases have begun.

     Capitated Radiological Services.  PhyMed has recently completed a letter of
agreement  with a  national  firm.  Under the  agreement,  PhyMed  will  provide
radiological  technical  services  on a  capitated  basis  to  approximately  40
physician  offices in Texas.  PhyMed will provide these services on an exclusive
basis.

     A second  agreement  is being  negotiated  with another  large  independent
physician's (IPA) association in the Dallas market. Under this agreement, PhyMed
will provide all of the IPA's radiological  services on an exclusive basis. This
agreement  will also have a capitated  element as well as a traditional  payment
element.


                                        3

<PAGE>



     Proposals for capitated  agreements  are being prepared for large payors in
the Dallas  marketplace.  These  proposals,  if successful,  would make PhyMed's
centers  the  exclusive  provider  of  radiological  services  for  the  payor's
subscribers in the targeted markets.

     Radiological   Professional   Practices.   PhyMed  has  relationships  with
physicians  specializing  in radiology and is  developing a management  practice
division to provide these specialized  services to its own Centers as well as to
other providers such as hospitals and clinics.  The long-range plan is that this
division  would  become  a  nationwide  provider  of  professional  radiological
services.

     Capitated  Services Division.  PhyMed has recently  established a Capitated
Services   Division  to  market  its   radiological   services  to  self-insured
corporations, health maintenance organizations, preferred provider organizations
and insurance  companies.  Under the  Capitated  Services  program,  PhyMed will
provide   radiological   services  under  a  exclusive   risk-based   system  of
reimbursement.  The payor the will pay PhyMed a negotiated  rate for each member
per month. The aim of the Capitated Services program is to provide the purchaser
a known  expense per month for the  services and PhyMed  receives  payments on a
regular  basis.   Working  with  the  payor,  PhyMed  will  develop  utilization
management  programs to help manage the utilization of radiological  services by
the members.

     PhyMed  intends  to  commence  negotiations  with  one  or  more  insurance
companies to offer its Capitated Services program by the beginning of the second
quarter 1998.

     Professional  Management  Services Division.  PhyMed has plans to develop a
physician  practice  management  and  services  division.   This  division  will
concentrate  in  the  radiologist  specialty  area.  Management  of  PhyMed  has
considerable  experience  in this  area of  medicine  and as a  medical  imaging
company can offer  radiologists  opportunities  to expand their practices and at
the same time increase the net revenues of PhyMed.

     See Items 5 and 6 below.

Item 5. Interest in Securities of the Issuer.

     (a)-(e) On April 3, 1998, George C. Barker, ("Barker"), individually and as
Trustee for the  Phy.Med.,  Inc.  Employee  Stock  Ownership  Plan (the "ESOP"),
acquired  control of the Registrant.  Prior to such date, such parties owned all
the outstanding shares of Phy.Med., Inc., a Texas corporation ("PhyMed"), and on
such  date  they  acquired  from the  Registrant,  in the  aggregate,  immediate
ownership of and the right to receive an aggregate of 69,415,409  authorized but
unissued  shares of  Common  Stock,  $.001  par  value,  of the  Registrant,  as
presently  constituted,  which,  if all  such  shares  were  outstanding,  would
constitute 88.5% of the Registrant's  presently outstanding 78,430,965 shares of
Common Stock (87.5% of the  79,331,896  shares which would be  outstanding  on a
fully diluted basis).

     The terms of the  acquisition  contemplate  a 1-for-10  reverse stock split
which will become

                                        4

<PAGE>



effective  after   compliance  with  all  necessary   corporate  and  regulatory
formalities  (presently  estimated to be in May 1998). Upon the effectiveness of
such reverse split,  Barker and the ESOP will own 6,941,541  shares of 7,843,097
shares, $.01 par value,  outstanding (7,933,190 shares on a full diluted basis).
(The  Registrant  will  continue  to have  50,000,000  shares  of  Common  Stock
authorized.)

     Barker  is the sole  trustee  of the ESOP and as such has the power to vote
the shares  owned by the ESOP on matters  such as the  uncontested  election  of
Directors.  Barker  and  his  wife,  Judith  F.  Barker,  own in  the  aggregate
approximately 70% of the vested interests of the participants in the ESOP.

     On March 6, 1998,  certain  parties  entered into an Agreement  and Plan of
Reorganization  and Merger (the  "Agreement").  The parties  were Barker and the
ESOP,  in their  capacity as the  shareholders  of PhyMed,  PhyMed  itself,  the
Registrant  and  Tatonka  Subsidiary,  Inc.,  a  newly-formed  and  wholly-owned
subsidiary of the Registrant. The Agreement was consummated on April 3, 1998, by
means of a statutory merger of Tatonka Subsidiary, Inc. into PhyMed, with PhyMed
being the surviving corporation. As a result of the merger, PhyMed is now an 80%
owned  subsidiary  of the  Registrant,  and the ESOP owns the  remaining  20% of
PhyMed.

     Prior to the merger, there were 800 common shares of PhyMed outstanding, of
which 500 were owned by Barker, individually, and 300 were owned by the ESOP.

     In the merger,  the 500 PhyMed common shares owned by Barker were converted
into immediate ownership of and the right to receive 54,230,788 shares of Common
Stock of the  Registrant,  and 140 of the 300 PhyMed  common shares owned by the
ESOP were converted in like manner into 15,184,621 shares of Common Stock of the
Registrant.  The  remaining  160  PhyMed  common  shares  held by the  ESOP  now
constitute the 20% of PhyMed common shares not owned by the Registrant.

     The  Registrant  has  50,000,000  shares of  Common  Stock  authorized  for
issuance  and,  at the time of the  merger,  had  9,916,487  shares  issued  and
outstanding or reserved for issuance. To the extent that the terms of the merger
would have resulted in the issuance of more than 50,000,000  shares,  the excess
over 50,000,000  shall not be issued until such time as the  stockholders of the
Registrant   have  approved  an  appropriate   amendment  to  the   Registrant's
Certificate of Incorporation.  Prior to such approval,  Barker and the ESOP will
continue to have a contractual right, pursuant to the Agreement and the Articles
of Merger filed with the  Secretary of State of Texas at the time of the merger,
to receive such excess shares, subject to such required stockholder approval.

     In summary,  Barker and the ESOP received an aggregate of 40,083,513 shares
of the  Registrant  at the time of the  merger,  the same  being  80.167% of the
50,000,000 and  outstanding  shares on a  fully-diluted  basis.  Of such number,
Barker,  individually,  received 31,315,245 shares  (approximately 62.6%) of the
outstanding  shares,  and the  ESOP  received  8,768,268  shares  (approximately
17.5%), both percentages on a fully-diluted basis.


                                        5

<PAGE>



     Barker and the ESOP continue to have a contractual right to receive, in the
aggregate,  an additional  29,331,896 shares, which will result in their having,
collectively,  87.5% of the Common Stock of the  Registrant  on a  fully-diluted
basis.  Of such  additional  shares,  22,915,544  will be  received  by  Barker,
individually, and 6,416,352 shares will be received by the ESOP.

     The parties to the  Agreement  contemplate  that the Board of Directors and
stockholders  of the  Registrant  will approve an amendment to the  Registrant's
Certificate of Incorporation approving a 1-for-10 reverse stock split (including
an  increase  in the par value of the  Common  Stock  from  $.001 to $.01) and a
change of the Registrant's  name to "PhyMed,  Inc.".  Upon the  effectiveness of
such  reverse  stock  split,  all  outstanding  shares  of  common  stock of the
Registrant,  including  the shares which were issued to Barker and the ESOP upon
the  effectiveness  of the merger,  will  represent  one-tenth  (1/10th) as many
shares.  In addition,  all shares  reserved for  issuance,  including the shares
which the Registrant will still have a contractual obligation to issue to Barker
and the ESOP, will become rights to receive  one-tenth  (1/10th) as many shares.
The  unissued  shares  due  Barker  and the ESOP  from the  merger  will then be
immediately  issued because the Registrant will then have a sufficient number of
authorized but unissued shares to issue for this purpose.

Possible Change of Control

     The 800  shares of PhyMed  owned by Barker  and the ESOP at the time of the
merger were pledged to Patrick Alan Luckett ("Luckett") to secure the payment of
(a) two promissory  notes payable to the order of Luckett,  which were issued to
him as  partial  payment  for  shares of PhyMed  purchased  from him,  and (b) a
guaranty of such notes.

     On September 21, 1993,  Barker and Luckett  owned all the then  outstanding
common shares of PhyMed, Inc., each of them owning of 500 common shares. On such
date  Luckett  sold 200 of his shares to PhyMed and 300 shares to the ESOP.  The
sales were for cash and promissory  notes.  One note was issued by PhyMed in the
original  principal  amount  of  $800,000  pursuant  to the  terms of a Loan and
Security  Agreement dated September 21, 1993, and the second promissory note was
issued by the ESOP in the original principal amount of $800,000. Both notes were
guaranteed by Barker.  The PhyMed note was secured by the 200 shares repurchased
from  Luckett  by PhyMed;  the ESOP note was  secured by the 300 shares the ESOP
purchased from Luckett;  and the 500 shares already owned by Barker were pledged
to secure his guaranty of the two notes.

     The  aggregate  of  69,415,409  shares  of Common  Stock of the  Registrant
received  and to be  received  by Barker  and the ESOP as a result of the merger
have been and will be  substituted in the pledge for the 640 PhyMed shares which
were released from the pledge and converted  into such shares of Common Stock of
the  Registrant.  The 20% of PhyMed still owned by the ESOP remains  pledged for
such purpose.

     As of April 1, 1998,  the unpaid  principal  balance on the PhyMed note was
$186,008, and the ESOP note was $384,167.



                                        6

<PAGE>



     Except as set forth in this Schedule  13D,  including  Item 6 below,  there
have  been no  transactions  by Barker  or the ESOP in the  Common  Stock of the
Registrant within the last 60 days.

     See Item 6 below.

     Item 6.  Contracts,  Arrangements,  Understandings  or  Relationships  With
Respect to Securities of the Issuer.

     See Item 5 above.

     The Board of Directors of the Registrant has agreed informally to grant Mr.
Barker an option to purchase  500,000  shares of Common Stock with vesting to be
contingent upon the attainment by the Company of certain  financial  objectives.
The Board of Directors has also agreed informally to grant each Mr. Love and Mr.
Foor an option to purchase  250,000  shares of Common  Stock.  The terms of such
options have not yet been determined by the Board of Directors.

     Except as set forth in this Schedule 13D,  there are no presently  existing
contracts or other agreements  between Barker and any other person regarding the
securities of the Registrant.

     Item 7. Material to Be Filed as Exhibits

     Attached as Exhibits are the following documents:

         Exhibit Number                  Description
         --------------                  -----------                

          1.   Agreement and Plan of Reorganization and Merger dated as of March
               6,  1998  by  and  among  Tatonka  Energy,  Inc.  Tatonka  Energy
               Subsidiary,  Inc. Phy. Med., Inc. and the Stockholders of PhyMed,
               Inc.

                                        7

<PAGE>



                                    SIGNATURE



     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.





Date: April 10, 1998                         /s/ George C. Barker
                                             --------------------
                                             George C. Barker
























                   
                                        8

<PAGE>



                            EXHIBIT 1 TO SCHEDULE 13D













                 AGREEMENT AND PLAN OF REORGANIZATION AND MERGER

                                   dated as of

                                  March 6, 1998

                                  by and among

                              TATONKA ENERGY, INC.
                           (an Oklahoma corporation);


                         TATONKA ENERGY SUBSIDIARY, INC.
                             (a Texas corporation),


                                 PHY. MED., INC.
                              (a Texas corporation)


                                       and


                        THE STOCKHOLDERS OF PHYMED, INC.



                                        9

<PAGE>

<TABLE>


                                TABLE OF CONTENTS

<S>                                                                             <C>                   <C>    
                                                                                                      Page
ARTICLE I  DEFINITIONS...................................................................................2
         Section 1.1   Definitions.......................................................................2
         Section 1.2   Rules Of Interpretation...........................................................5

ARTICLE II  THE MERGER...................................................................................5
         Section 2.1   The Merger........................................................................5
         Section 2.2   The Closing.......................................................................6
         Section 2.3   Effective Time....................................................................6
         Section 2.4   Articles of Incorporation of Surviving Corporation................................6
         Section 2.5   Bylaws of Surviving Corporation...................................................6
         Section 2.6   Directors of the Surviving Corporation............................................6
         Section 2.7   Officers of the Surviving Corporation.............................................6
         Section 2.8   Conversion of Company Common Stock................................................6
         Section 2.9   Exchange of Certificates Representing Shares of the Company
                  Common Stock...........................................................................8
         Section 2.10   Fractional Shares................................................................8

         Section 2.11 Percentage Protection Provision....................................................8

ARTICLE III  REPRESENTATIONS AND WARRANTIES OF THE COMPANY...............................................9
         Section 3.1   Organization and Good Standing; Qualification.....................................9
         Section 3.2   Authorization and Validity.......................................................10
         Section 3.3   Governmental Authorization.......................................................10
         Section 3.4   Capitalization...................................................................10
         Section 3.5   Transactions in Capital Stock....................................................11
         Section 3.6   Continuity of Business Enterprise................................................11
         Section 3.7   Subsidiaries and Investments.....................................................11
         Section 3.8   Absence of Conflicting Agreements or Required Consents...........................11
         Section 3.9   Absence of Changes...............................................................12
         Section 3.10  No Undisclosed Liabilities.......................................................13
         Section 3.11  Litigation and Claims............................................................13
         Section 3.12  No Violation of Law..............................................................13
         Section 3.13  Lease Agreements.................................................................13
         Section 3.14  Real and Personal Property.......................................................14
         Section 3.15  Indebtedness for Borrowed Money..................................................14
         Section 3.16  Contracts and Commitments........................................................14
         Section 3.17  Employee Matters.................................................................15
         Section 3.18  Labor Relations..................................................................16
         Section 3.19  Employee Benefit Plans...........................................................16
         Section 3.20  Environmental Matters............................................................18
         Section 3.21  Filing Reports...................................................................19
         Section 3.22  Insurance Policies...............................................................19
         Section 3.23  Licenses, Authorization and Provider Programs....................................20

                                       10

<PAGE>



         Section 3.24  Inspections and Investigations...................................................21
         Section 3.25  Proprietary Rights and Information...............................................22
         Section 3.26  Taxes............................................................................22
         Section 3.27  Related Party Arrangements.......................................................24
         Section 3.28  Banking Relations................................................................24
         Section 3.29  Fraud and Abuse and Self Referral................................................24
         Section 3.30  Restrictions on Business Activities..............................................24
         Section 3.31  Agreements in Full Force and Effect..............................................24
         Section 3.32  Statements True and Correct......................................................25
         Section 3.33  Disclosure Schedules.............................................................25
         Section 3.34  Finders' Fees....................................................................25

ARTICLE IV REPRESENTATIONS AND WARRANTIES OF TATONKA....................................................25
         Section 4.1   Organization and Good Standing; Qualification....................................25
         Section 4.2   Authorization and Validity.......................................................26
         Section 4.3   Governmental Authorization.......................................................26
         Section 4.4   Capitalization...................................................................26
         Section 4.5   Absence of Conflicting Agreements or Required Consents...........................27
         Section 4.6   Absence of Changes...............................................................28
         Section 4.7   No Undisclosed Liabilities.......................................................28
         Section 4.8   Litigation and Claims............................................................28
         Section 4.9   No Violation of Law..............................................................28
         Section 4.10  Employee Matters.................................................................28
         Section 4.11  Taxes............................................................................28
         Section 4.12  Related Party Arrangements.......................................................30
         Section 4.13  Statements True and Correct......................................................30
         Section 4.14  Disclosure Schedules.............................................................30
         Section 4.15  Finder's Fees....................................................................30

ARTICLE V CLOSING DATE REPRESENTATIONS AND WARRANTIES REGARDING
                TATONKA SUB.............................................................................30
         Section 5.1   Authorization and Validity.......................................................30
         Section 5.2   No Violation.....................................................................30
         Section 5.3   No Business, Agreements, Assets or Liabilities ..................................30

ARTICLE VI COVENANTS OF THE COMPANY.....................................................................31
         Section 6.1   Conduct of The Company...........................................................31
         Section 6.2   Title to Assets; Indebtedness....................................................32
         Section 6.3   Access...........................................................................32
         Section 6.4   Acquisition Proposals............................................................33
         Section 6.5   Compliance With Obligations......................................................33
         Section 6.6   Notice of Certain Events.........................................................33
         Section 6.7   Stockholders' Consent............................................................34
         Section 6.8   Obligations of Company and Stockholders..........................................34
         Section 6.9  Accounting and Tax Matters........................................................34

                                       11

<PAGE>



ARTICLE VII  COVENANTS OF TATONKA.......................................................................35
         Section 7.1   Consummation of Agreement........................................................35
         Section 7.2   Requirements to Effect the Merger and Acquisitions...............................35
         Section 7.3   Access...........................................................................35
         Section 7.4   Notification of Certain Matters..................................................35

ARTICLE VIII  COVENANTS OF TATONKA AND THE COMPANY......................................................35
         Section 8.1   Filings; Other Action............................................................35
         Section 8.2   Amendments of Disclosure Schedules...............................................36
         Section 8.3   Actions Contrary to Stated Intent................................................36
         Section 8.4   Public Announcements.............................................................37
         Section 8.5   Expenses.........................................................................37
         Section 8.6   Patient Confidentiality..........................................................37
         Section 8.7   1934 Act filings.................................................................37

ARTICLE IX  CONDITIONS PRECEDENT OF TATONKA AND TATONKA SUB.............................................37
         Section 9.1  Representations and Warranties....................................................37
         Section 9.2  Covenants.........................................................................37
         Section 9.3  Proceedings.......................................................................37
         Section 9.4  No Material Adverse Effect........................................................38
         Section 9.5  Government Approvals and Required Consents........................................38
         Section 9.6  Closing Deliveries................................................................38
         Section 9.7  Stockholder Representation Letter.................................................38

ARTICLE X  CONDITIONS PRECEDENT OF THE COMPANY..........................................................38
         Section 10.1  Representations and Warranties...................................................38
         Section 10.2  Covenants........................................................................38
         Section 10.3  Proceedings......................................................................38
         Section 10.4  Government Approvals and Required Consents.......................................38
         Section 10.5  Closing Deliveries...............................................................38
         Section 10.6  No Material Adverse Effect.......................................................38

ARTICLE XI  CLOSING DELIVERIES..........................................................................39
         Section 11.1  Deliveries of the Company........................................................39
         Section 11.2  Deliveries of Tatonka............................................................40

ARTICLE XII  POST CLOSING MATTERS.......................................................................41
         Section 12.1  Further Instruments of Transfer..................................................41
         Section 12.2  Merger Tax Covenant..............................................................41
         Section 12.3  Current Public Information.......................................................41
         Section 12.4  Change of Tatonka Name...........................................................41

ARTICLE XIII  REMEDIES..................................................................................42
         Section 13.1  Indemnification by the Company and the Stockholders..............................42
         Section 13.2  Indemnification by Tatonka.......................................................42
         Section 13.3  Conditions of Indemnification....................................................43
         Section 13.4  Costs, Expenses and Legal Fees...................................................46
         Section 13.5  Tax Benefits; Insurance Proceeds.................................................46
         Section 13.6  Dispute Resolution...............................................................46

                                       12

<PAGE>



ARTICLE XIV  TERMINATION................................................................................48
         Section 14.1  Termination......................................................................48
         Section 14.2  Effect of Termination............................................................48

ARTICLE XV  NONDISCLOSURE OF CONFIDENTIAL INFORMATION...................................................49
         Section 15.1  Non-Disclosure Covenant..........................................................49
         Section 15.2  Damages..........................................................................50
         Section 15.3  Survival.........................................................................50

ARTICLE XVI  MISCELLANEOUS..............................................................................50
         Section 16.1  Amendment; Waivers...............................................................50
         Section 16.2  Assignment.......................................................................50
         Section 16.3  Parties in Interest; No Third Party Beneficiaries................................50
         Section 16.4  Entire Agreement.................................................................50
         Section 16.5  Severability.....................................................................50
         Section 16.6  Survival of Representations, Warranties and Covenants............................51
         Section 16.7  Governing Law....................................................................51
         Section 16.8  Captions.........................................................................51
         Section 16.9  Gender and Number................................................................51
         Section 16.10 Confidentiality; Publicity and Disclosures.......................................51
         Section 16.11 Notice...........................................................................52
         Section 16.12 No Waiver; Remedies..............................................................53
         Section 16.13 Counterparts.....................................................................53
         Section 16.14 Defined Terms....................................................................53

                                    EXHIBITS

Exhibit A - Merger Consideration.......................................................................A-1
Exhibit B - Tatonka Energy, Inc. Preferred Stock Listing...............................................B-1
Exhibit C - Stockholder Representation Letter..........................................................C-1

</TABLE>


                                       13

<PAGE>



                 AGREEMENT AND PLAN OF REORGANIZATION AND MERGER


     This Agreement and Plan of Merger (this "Agreement"),  dated as of March 6,
1998, is by and among TATONKA ENERGY, INC., an Oklahoma corporation ("Tatonka"),
TATONKA  ENERGY  SUBSIDIARY,  INC.,  a  Texas  corporation  and  a  wholly-owned
subsidiary of Tatonka ("Tatonka Sub"), PHY. MED., INC., a Texas corporation (the
"Company") and GEORGE C. BARKER,  a Texas  resident  ("Barker") and the EMPLOYEE
STOCK  OWNERSHIP PLAN OF PHY. MED.,  INC. (the  "ESOP")(Barker  and the ESOP are
collectively the "Stockholders").

                                    Recitals

     A. The  Company  is  engaged  in the  business  of  owning,  operating  and
acquiring  the assets of, and managing  the  non-medical  aspects of,  radiology
practices and diagnostic imaging centers.  All of the shares of the common stock
of the Company (the "Company Common Stock") are owned beneficially and of record
by the Stockholders.

     B.  Tatonka  is  a  publicly-held  company  that  desires  to  acquire  the
operations of the Company.

     C. Pursuant to this Agreement, Tatonka, Tatonka Sub, and the Company intend
that  Tatonka Sub be merged with and into the  Company,  and that the Company be
the sole surviving corporation  (sometimes called the "Surviving  Corporation"),
and  Tatonka  Sub  be  the  disappearing   corporation   (sometimes  called  the
"Disappearing Corporation").

     D. Tatonka,  Tatonka Sub and the Company have each  determined to engage in
the  transactions  contemplated  hereby,  pursuant to which (i) Tatonka Sub will
merge with and into the Company upon the terms and  conditions set forth in this
Agreement and in accordance with the laws of the State of Texas, (ii) 80% of the
outstanding  shares of the Company  Common Stock shall be converted at such time
into shares of common stock, par value $.001 per share, of Tatonka (the "Tatonka
Common  Stock")  as set forth in this  Agreement,  and (iii) the  Company  shall
become an 80% owned subsidiary of Tatonka.

     E. The parties intend for the transaction contemplated by this Agreement to
qualify as a statutory  merger within the meaning of Section 368 of the Internal
Revenue Code of 1986,  as amended (the "Code") and the  regulations  promulgated
thereunder.

     F. Tatonka has  50,000,000  shares of Common Stock  authorized for issuance
and 9,916,487  shares issued and outstanding or reserved for issuance.  Issuance
at the effective Time of all the shares  representing  the Merger  Consideration
would result in the issuance of more than such 50,000,000 authorized shares.

     G. The parties to this  Agreement  contemplate  that the Board of Directors
and  stockholders of Tatonka will approve an amendment to Tatonka's  Certificate
of Incorporation approving a 1-for-10 reverse stock split.

                                        1

<PAGE>



     H. Upon the  effectiveness  of such reverse  stock split,  the shares which
have been  issued  to the  Stockholders  at the  Effective  Time will  represent
one-tenth  (1/10th) as many shares as when issued at the Effective Time, and the
unissued number of shares which Tatonka will still have a contractual obligation
to issue will also thereafter become one-tenth  (1/10th) as many shares and will
be  immediately  issued  because  Tatonka will then have a sufficient  number of
authorized but unissued shares to issue for this purpose.

                              Terms and Conditions

     NOW,  THEREFORE,  in consideration of the preceding recitals and the mutual
representations,   warranties,  covenants  and  agreements  set  forth  in  this
Agreement, the parties agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

     Section 1.1.  Definitions.  As used in this Agreement,  the following terms
shall have the meanings set forth below:

     "Affiliate"  with respect to any person shall mean a person that,  directly
or indirectly through one or more intermediaries, controls, is controlled by, or
is under common control with, such person.

     "Agreement"  shall  have the  meaning  set  forth in the  preamble  to this
Agreement.

     "Best  knowledge" or "to the  knowledge of" and similar  phrases shall mean
(i) in the case of a natural  person,  the  particular  fact was  known,  or not
known, as the context  requires,  to such person after reasonable  investigation
and inquiry by such person,  and (ii) in the case of an entity,  the  particular
fact  was  known,  or  not  known,  as  the  context  requires,  to  any  of the
Stockholders,  director or  executive  officer of such entity  after  reasonable
investigation  and inquiry by the executive  officers of such entity;  provided,
however,  that  to  the  extent  any  of  the  representations,  warranties  and
statements  of the  Company  made  specifically  in  Section  3.20 is  expressly
qualified to the knowledge or best  knowledge of the Company,  it shall mean the
knowledge  of any of the  Stockholders,  director  or  executive  officer of the
Company  actually  possesses  without the necessity of any special inquiry as to
the matters which are the subject thereof.

     "Claim Notice" shall have the meaning set forth in Section 13.3(a).

     "Closing" shall mean the closing of the  transactions  contemplated by this
Agreement as set forth in Section 2.2.

     "Closing Date" shall have the meaning set forth in Section 2.2.

     "Code" shall have the meaning set forth in the recitals to this Agreement.

     "Company"  shall  have  the  meaning  set  forth  in the  preamble  to this
Agreement.

     "Company  Common Stock" shall have the meaning set forth in the recitals to
this Agreement.

                                        2

<PAGE>



     "Company Balance Sheet" shall mean the unaudited consolidated balance sheet
of Company and its Subsidiaries as of December 31, 1997.

     "Company Financial Statements" shall mean the Company Balance Sheet and the
related  statements  of  operations  and cash flows of Company  and the  Company
Subsidiaries for the three months and twelve months then ended.

     "Company   Right"  shall  mean  all   arrangements,   calls,   commitments,
agreements,  options, rights to subscribe to, scrips, understandings,  warrants,
or  other  binding  obligations  of  any  character  whatsoever  relating  to or
securities or rights  convertible  into or  exchangeable  for, shares of Company
Common  Stock,  or by which the  Company is or may be bound to issue  additional
shares of Company Common Stock or other Company Rights.

     "Company Subsidiaries" shall have the meaning set forth in Section 3.7.

     "Confidential   Information"   shall  mean  all  trade  secrets  and  other
confidential and/or proprietary information of the particular person, including,
but not limited to, information derived from reports, processes, data, know-how,
software   programs,   improvements,    inventions,   strategies,   compensation
structures,  reports,   investigations,   research,  work  in  progress,  codes,
marketing and sales programs and plans, financial  projections,  cost summaries,
formulae,  contract analyses,  financial  information,  forecasts,  confidential
filings with any state or Federal agency, and all other  confidential  concepts,
methods of doing business, ideas, materials or information prepared or performed
for,  by or on behalf  of such  person by its  employees,  officers,  directors,
agents, representatives, or consultants.

     "Damages" shall have the meaning set forth in Section 13.1.

     "Disappearing Corporation" shall have the meaning set forth in the recitals
to this Agreement.

     "Disclosure  Schedules" shall mean the schedules attached to this Agreement
as of this date or  otherwise  delivered  by any party  pursuant to the terms of
this Agreement, as amended or supplemented.

     "Effective Time" shall have the meaning set forth in Section 2.3.

     "Election Period" shall have the meaning set forth in Section 13.3(a).

     "Encumbrance"  shall mean any charge,  claim,  community property interest,
equitable  interest,  lien, option,  pledge,  security interest,  right of first
refusal,  or restriction of any kind,  including any restriction on use, voting,
transfer, receipt of income or exercise of any other attribute of ownership.

     "Environmental Laws" shall have the meaning set forth in Section 3.20(e).

     "ERISA" shall have the meaning set forth in Section 3.17.

     "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended.

     "Indemnified Party" shall have the meaning set forth in Section 13.3(a).

     "Indemnifying Party" shall have the meaning set forth in Section 13.3(a).

                                        3

<PAGE>



     "Indemnity Notice" shall have the meaning set forth in Section 13.3(d).

     "Insurance Policies" shall have the meaning set forth in Section 3.22.

     "IRS" shall mean the Internal Revenue Service.

     "Lease Agreements" shall have the meaning set forth in Section 3.13.

     "Material  Adverse  Effect"  shall  mean a material  adverse  effect on the
assets, properties,  business,  operations,  condition (financial or otherwise),
liabilities or results of operations of the Person or Persons being referred to,
taken  as  a  whole  (including  its  consolidated  subsidiaries,  if  any),  in
consideration of all relevant facts and circumstances.

     "Medical  Waste"  shall mean (i)  pathological  waste,  (ii)  blood,  (iii)
sharps,  (iv) wastes from  surgery or autopsy,  (v)  dialysis  waste,  including
contaminated  disposable  equipment  and  supplies,  (vi) cultures and stocks of
infectious agents and associated  biological agents, (vii) contaminated animals,
(viii) isolation wastes, (ix) contaminated equipment, (x) laboratory waste, (xi)
any substance, pollutant, material, or contaminant listed or regulated under any
Medical  Waste Law, and (xii) other  biological  waste and  discarded  materials
contaminated  with or  exposed to blood,  excretion,  or  secretions  from human
beings or animals.

     "Medical  Waste  Laws"  shall  mean the  following,  including  regulations
promulgated  and orders issued  thereunder,  as in effect on the date hereof and
the Closing  Date:  (i) the MWTA,  (ii) the U.S.  Public  Vessel  Medical  Waste
Anti-Dumping  Act of 1988,  33 USCA  Sections  2501 et seq.,  (iii)  the  Marine
Protection,  Research,  and  Sanctuaries  Act of 1972,  33 USCA Sections 1401 et
seq., (iv) The Occupational Safety and Health Act, 29 USCA Sections 651 et seq.,
(v) the  United  States  Department  of  Health  and  Human  Services,  National
Institute  for  Occupational  Safety  and  Health,   Infectious  Waste  Disposal
Guidelines, Publication No. 88-119, and (vi) any other Federal, state, regional,
county,  municipal, or other local laws, regulations,  and ordinances insofar as
they are applicable to any of the Company's  assets or operations and purport to
regulate Medical Waste or impose requirements related to Medical Waste.

     "Merger" shall have the meaning set forth in Section 2.1.

     "Merger Consideration" shall have the meaning set forth in Section 2.8(a).

     "MWTA"  shall  mean the  Medical  Waste  Tracking  Act of 1988,  42  U.S.C.
Sections 6992, et seq.

     "Ordinary  course of business"  shall mean the usual and  customary  way in
which the particular entity has conducted its business in the past.

     "Payors" shall mean any and all private or governmental Persons,  obligated
by contract or by law to render payment to the Company in  consideration  of the
performance of professional  medical or technical  services  including,  but not
limited to,  Medicare  and Medicaid  Programs  (as defined in Section  3.23(a)),
insurance  companies,  health  maintenance  organizations,   preferred  provider
organizations,  independent practice associations,  hospitals, hospital systems,
integrated delivery systems and CHAMPUS.

                                        4

<PAGE>



     "Person" shall mean any natural  person,  corporation,  partnership,  joint
venture, limited liability company,  association,  group,  organization or other
entity.

     "Regulated Activity" shall have the meaning set forth in Section 3.20(c).

     "Reorganization" shall have the meaning set forth in Section 12.2.

     "SEC" shall mean the Securities and Exchange Commission.

     "Securities Act" shall mean the Securities Act of 1933, as amended.

     "Stockholders" shall mean the stockholders of the Company immediately prior
to the Effective Time.

     "Surviving Corporation" shall have the meaning set forth in the recitals to
this Agreement.

     "Tatonka"  shall  have  the  meaning  set  forth  in the  preamble  to this
Agreement.

     "Tatonka  Common Stock" shall have the meaning set forth in the recitals to
this Agreement.

     "Tatonka  Current  Balance  Sheet"  shall mean the  unaudited  consolidated
balance sheet of Tatonka and its Subsidiaries as of September 30, 1997.

     "Tatonka Subsidiaries" shall have the meaning set forth in Section 4.5.

     "Tax Returns" shall include all Federal,  state,  local or foreign  income,
excise,  corporate,  franchise,  property,  sales,  use,  payroll,  withholding,
provider,  environmental,  duties,  value added and other tax returns (including
information returns).

     "Third Party Claim" shall have the meaning set forth in Section 13.3(a).

     Section 1.2. Rules Of Interpretation.  The definitions set forth in Section
1.1 shall be equally applicable to both the singular and the plural forms of the
terms therein defined and shall cover both genders.

     Unless otherwise  indicated,  reference o an Article number (e.g.,  Article
IV) or a Section number (e.g., Section 6.2) shall be construed to be a reference
to the designated Article number or Section number of this Agreement.

                                   ARTICLE II
                                   THE MERGER

     Section  2.1.  The  Merger.  Subject  to the terms and  conditions  of this
Agreement,  at the Effective Time, Tatonka Sub shall be merged with and into the
Company in accordance with this Agreement and the separate  corporate  existence
of the  Disappearing  Corporation  shall  thereupon  cease (the  "Merger").  The
Company shall be the Surviving  Corporation  in the Merger and shall continue to
be  governed  by the laws of the  State of  Texas,  and the  separate  corporate
existence of the Company with all its rights,  privileges,  powers,  immunities,
purposes and franchises shall continue  unaffected by the Merger,  except as set
forth in this Agreement.  The Surviving  Corporation may, at any time concurrent
with and/or

                                        5

<PAGE>



after the  Effective  Time,  take any  action in the name of or on behalf of the
Disappearing Corporation in order to effectuate the transactions contemplated by
this Agreement.

     Section 2.2. The Closing.  Unless this  Agreement  has been  terminated  in
accordance with its terms, the closing (the "Closing") shall take place at 10:00
a.m.,  local time,  on March 20, 1998,  at the offices of McKinnon & Associates,
Inc., a Professional  Corporation,  10000 North Central Expressway,  Suite 1540,
Dallas,  Texas  75231-416,  or such other time  and/or  place as may be mutually
agreed by the parties to this  Agreement.  If the  Closing  shall not have taken
place by April 30, 1998, this Agreement shall automatically  terminate and shall
be of no further force or effect, unless extended by the mutual agreement of the
parties to this Agreement.

     Section 2.3.  Effective Time. If all the conditions to the Merger set forth
in Articles IX and X shall have been fulfilled or waived in accordance  herewith
and this  Agreement  shall not have been  terminated in accordance  with Article
XIV,  the parties  hereto  shall cause to be properly  executed and filed on the
Closing Date, Articles of Merger meeting the requirements of Section 5.04 of the
Texas Business Corporation Act. The Merger shall become effective at the time of
the filing of such  documents with the Secretary of State of the State of Texas,
in accordance  with such law or at such later time which the parties have agreed
upon and  designated  in such filings as the  effective  time of the Merger (the
"Effective Time").

     Section 2.4. Articles of Incorporation of Surviving Corporation.  Effective
at the Effective  Time, the Articles of  Incorporation  of the Company in effect
immediately  prior to the Effective Time shall be the Articles of  Incorporation
of the  Surviving  Corporation  provided  that the Articles  shall be amended to
change the name of the Surviving  Corporation  to "PhyMed  Diagnostic  Imagining
Center Dallas,  Inc." and to limit the liability of directors as permitted under
the Texas Business Corporation Act.

     Section 2.5. Bylaws of Surviving Corporation.  The Bylaws of Tatonka Sub in
effect  immediately  prior to the  Effective  Time  shall be the  Bylaws  of the
Surviving  Corporation  without any amendment or modification as a result of the
Merger, until duly amended in accordance with applicable laws.

     Section 2.6.  Directors of the Surviving  Corporation.  The persons who are
directors of the Company  immediately prior to the Effective Time shall submit a
written resignation in form and substance acceptable to Tatonka, effective as of
the Effective  Time.  The directors of the Surviving  Corporation  following the
Effective Time shall be set forth in Exhibit 2.6.

     Section 2.7.  Officers of the  Surviving  Corporation.  The persons who are
officers of the Company  immediately  prior to the Effective Time shall submit a
written resignation in form and substance acceptable to Tatonka, effective as of
the  Effective  Time.  The officers of the Surviving  Corporation  following the
Effective Time shall be set forth in Exhibit 2.7.

     Section 2.8.  Conversion of Company Common Stock.  The manner of converting
shares of Company Common Stock in the Merger shall be as follows:

     (a) As a result of the  Merger  and  without  any action on the part of the
holder thereof,

                                        6

<PAGE>



                  (i) all 500 shares of Company  Common  Stock held by Barker at
     the Effective Time shall cease to be outstanding  and shall be canceled and
     retired  and shall  cease to exist,  and the  certificate  or  certificates
     representing shares of Company Common Stock held by Barker shall thereafter
     cease to have any  rights  with  respect to such  shares of Company  Common
     Stock,  except  the  right  to  receive  validly  issued,  fully  paid  and
     nonassessable  shares of Tatonka  Common Stock as  determined in accordance
     with the provisions of Exhibit A attached hereto; and

                  (ii) 140 of the 300 shares of Company Common Stock held by the
     ESOP at the  Effective  Time  shall  cease to be  outstanding  and shall be
     canceled  and  retired  and shall cease to exist,  and the  certificate  or
     certificates  representing  140 of the 300 shares of Company  Common  Stock
     held by the ESOP shall  thereafter cease to have any rights with respect to
     such shares of Company  Common Stock,  except the right to receive  validly
     issued,  fully paid and  nonassessable  shares of Tatonka  Common  Stock as
     determined in accordance with the provisions of Exhibit A attached hereto;

such  shares  of  Tatonka   Common   Stock  are   referred  to  as  the  "Merger
Consideration".

     Tatonka has 50,000,000  shares of Common Stock  authorized for issuance and
9,916,487 shares issued and outstanding or reserved for issuance.  To the extent
that the  application  of this  subsection  would result in the issuance of more
than 50,000,000  shares,  the excess over  50,000,000  shall not be issued until
such time as the Tatonka stockholders have approved an appropriate  amendment to
Tatonka's Certificate of Incorporation. Prior to such approval, the Stockholders
shall have a contractual  right  pursuant to this  Agreement and the Articles of
Merger filed with the Secretary of State of Texas to receive such excess shares,
subject to such required stockholder approval.

     The parties to this Agreement  contemplate  that the Board of Directors and
stockholders  of Tatonka will approve an amendment to Tatonka's  Certificate  of
Incorporation  approving a 1-for-10 reverse stock split.  Upon the effectiveness
of  such  reverse  stock  split,  the  shares  which  have  been  issued  to the
Stockholders  at the Effective  Time will represent  one-tenth  (1/10th) as many
shares as when issued at the Effective  Time, and the unissued  number of shares
which  Tatonka  will  still  have a  contractual  obligation  to issue will also
thereafter  become  one-tenth  (1/10th) as many  shares and will be  immediately
issued  because  Tatonka will then have a sufficient  number of  authorized  but
unissued shares to issue for this purpose.

            (b)  Each  share  of  Company  Common  Stock  held in the  Company's
treasury,  if any, at the  Effective  Time,  by virtue of the  Merger,  shall be
canceled and retired  without  payment of any  consideration  therefor and shall
cease to exist.

            (c) Each Company Right  outstanding  at the Effective  Time shall be
terminated and canceled,  without  payment of any  consideration  therefor,  and
shall cease to exist.

            (d) Each share of common stock of Tatonka Sub issued and outstanding
at the Effective Time shall be converted to one share of Company Common Stock.

            (e) At the Effective Time, each share of Tatonka Common Stock issued
and

                                        7

<PAGE>



outstanding as of the Effective Time shall,  by virtue of the Merger and without
any  action on the part of the holder  thereof,  continue  unchanged  and remain
outstanding as a validly issued,  fully paid and nonassessable  share of Tatonka
Common Stock.

     Section 2.9.  Exchange of Certificates  Representing  Shares of the Company
Common Stock.

            (a) At or  after  the  Effective  Time  and at the  Closing  (i) the
Stockholders, as holders of a certificate or certificates representing shares of
the Company's Common Stock to be surrendered pursuant to Section 2.8, shall upon
surrender of each  certificate  or  certificates  (or  completion of appropriate
affidavit of lost  certificate and indemnity)  receive such allocation of Merger
Consideration  as  determined  in  accordance  with the  provisions of Exhibit A
attached   hereto;   and  (ii)  until  each  such  certificate  or  certificates
representing Company Common Stock have been surrendered by the Stockholders, the
certificates for Company Common Stock to be surrendered  pursuant to Section 2.8
shall,  for  all  purposes,   represent  solely  the  right  to  receive  Merger
Consideration  as  determined  in  accordance  with the  provisions of Exhibit A
attached  hereto and Section 2.8 hereof,  if applicable.  At the Effective Time,
each share of Company Common Stock converted into Merger  Consideration shall by
virtue of the Merger and without any action on the part of the holders  thereof,
cease to be  outstanding,  be canceled  and  returned  and all shares of Tatonka
Common Stock  issuable to the  Stockholders  in the Merger as part of the Merger
Consideration shall be deemed for all purposes to have been issued by Tatonka at
the Effective Time.

            (b) Each  Stockholder  shall  deliver to Tatonka at the  Closing the
certificates representing Company Common Stock owned by him, her or it and to be
surrendered  pursuant to Section 2.8, duly endorsed in blank by the Stockholder,
or accompanied  by duly executed  stock powers in blank,  and with all necessary
transfer tax and other revenue stamps,  acquired at the  Stockholder's  expense,
affixed and canceled.  Each  Stockholder  agrees to cure any  deficiencies  with
respect to the endorsement of the  certificates or other documents of conveyance
with  respect to such  Company  Common Stock or with respect to the stock powers
accompanying  any Company  Common Stock.  Upon such  delivery (or  completion of
appropriate affidavit of lost certificate and indemnity), each Stockholder shall
receive in exchange therefor the Merger Consideration  pursuant to Exhibit A and
Section 2.8 hereof, if applicable.

            (c) The  foregoing  provisions  shall not apply to the 160 shares of
Company  Common Stock retained by the ESOP,  which shares shall remain  properly
outstanding and shall retain all rights,  privileges and designations applicable
to Company Common Stock immediately preceding the Merger.

     Section 2.10.  Fractional  Shares.  No fractional  shares of Tatonka Common
Stock will be issued.  Any  fractional  share of Tatonka Common Stock that would
otherwise be issuable as part of the Merger  Consideration  shall rounded to the
nearest whole share of Tatonka Common Stock.

     Section 2.11 Percentage Protection Provision. The parties to this Agreement
agree that they are entering into this  Agreement with the intention that Barker
and the ESOP will

                                        8

<PAGE>



have at least 87.5% of the shares of Tatonka Common Stock  outstanding after (a)
the Effective  Time and (b) the conversion of all the Tatonka  Preferred  Stock,
but before the  exercise of any of the three stock  options  contemplated  to be
issued by Tatonka  (after the Effective  Time) and referred to in Section 4.4 of
this  Agreement.  The  numbers  of shares of Tatonka  Common  Stock set forth on
Exhibit A as being issued to Barker and the ESOP at the Effective Time are based
on the  assumptions  that (a) no more than  9,015,556  shares of Tatonka  Common
Stock,  as presently  constituted,  will be  outstanding  at the Effective  Time
(exclusive of any shares that may be issued upon conversion of Tatonka Preferred
Stock prior to the  Effective  Time),  (b) no more than  900,931  shares will be
issued upon conversion of all the Tatonka  Preferred  Stock, (c) no other shares
of Tatonka  Common  Stock will be issued by virtue of any rights to receive  any
shares of Tatonka Common Stock or other  securities of Tatonka that exist at the
date  of this  Agreement  or  will  exist  at the  Effective  Time,  and (d) the
aggregate of 9,916,487 shares enumerated in (a) and (b) above will constitute no
more than 12.5% of the  shares of Tatonka  Common  Stock  outstanding  after the
events described above.

     The  parties  to this  Agreement  covenant  and agree that if more than the
9,916,487 shares of Tatonka Common Stock referred to in the foregoing  paragraph
are ultimately  issued by Tatonka as a consequence of the matters referred to in
such  paragraph,  Tatonka  shall  issue to Barker and the ESOP,  pro rata,  such
additional  number of shares of Tatonka  Common  Stock as shall be  necessary to
increase their collective  ownership  percentage of all shares of Tatonka Common
Stock outstanding after the events described above to 87.5%.

                                   ARTICLE III
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     As an  inducement  to Tatonka and Tatonka Sub to enter into this  Agreement
and to consummate the Merger and except as set forth in the Disclosure Schedules
attached to this  Agreement  and  incorporated  by this  reference,  the Company
represents  and  warrants to Tatonka and Tatonka Sub both as of this date and as
of the Effective Time as follows:

     Section 3.1. Organization and Good Standing;  Qualification. The Company is
a corporation  duly organized,  validly  existing and in good standing under the
laws of its  state of  incorporation,  with all  requisite  corporate  power and
authority to own,  operate and lease its assets and  properties  and to carry on
its business as currently conducted.  The Company and each Company Subsidiary is
in good standing in each jurisdiction  where the character of the property owned
or  leased  by it or the  nature  of its  activities  makes  such  qualification
necessary,  except where such  failure to be so  qualified  or in good  standing
would not have a Material Adverse Effect on the Company.  Copies of the articles
or certificates of incorporation  and all amendments  thereto of the Company and
each  Company  Subsidiary  and  the  bylaws  of the  Company  and  each  Company
Subsidiary,  as amended, and copies of the corporate minutes of the Company, all
of which have been or will be made available to Tatonka for review, are true and
complete  as in  effect  on the date of this  Agreement,  and in the case of the
corporate  minutes,   accurately   reflect  all  material   proceedings  of  the
Stockholders  and  directors of the Company (and all  committees  thereof).  The
stock record

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<PAGE>



books of the Company,  which have been or will be made  available to Tatonka for
review,  contain true,  complete and accurate  records of the stock ownership of
record of the  Company  and the  transfer  record of the  shares of its  capital
stock.

     Section 3.2.  Authorization  and  Validity.  The Company has all  requisite
corporate  power to enter into this Agreement and all other  agreements  entered
into in connection with the transactions  contemplated  hereby and to consummate
the transactions  contemplated  hereby. The execution,  delivery and, subject to
approval of this  Agreement and the Merger by the  Stockholders,  performance by
the Company of this Agreement and the agreements contemplated in this Agreement,
and the consummation by the Company of the transactions  contemplated hereby and
thereby are within the Company's  respective corporate powers and have been duly
authorized  by all  necessary  action  on the  part of the  Company's  Board  of
Directors.  Subject  to the  approval  of this  Agreement  and the Merger by the
Stockholders,  this  Agreement has been duly  executed by the Company,  and this
Agreement and all other  agreements and obligations  entered into and undertaken
in connection with the transactions  contemplated hereby to which the Company is
a party  constitute,  or upon  execution  will  constitute,  valid  and  binding
agreements  of the  Company,  enforceable  against it in  accordance  with their
respective terms, except as enforceability may be limited by bankruptcy or other
laws affecting the  enforcement of creditors'  rights  generally,  or by general
equity principles, or by public policy.

     Section 3.3.  Governmental  Authorization.  Other than  complying  with the
provisions of the applicable  state corporate laws regarding the approval of the
Merger and the filing of the Articles of Merger (as contemplated by Section 2.3)
and any other required documents related to the Merger, and other than consents,
filings or  notifications  required to be made or obtained  solely by Tatonka or
Tatonka Sub, the  execution,  delivery  and  performance  by the Company of this
Agreement  and  the  agreements   provided  for  in  this  Agreement,   and  the
consummation of the transactions  contemplated hereby and thereby by the Company
require no action by or in respect of, or filing with,  any  governmental  body,
agency, official or authority.

     Section 3.4.  Capitalization.  The authorized  capital stock of the Company
consists of 1,000 shares of the Company  Common  Stock,  of which 800 shares are
issued and outstanding. Barker owns of record and beneficially 500 shares of the
Company Common Stock, and the ESOP owns of record and beneficially 300 shares of
the  Company  Common  Stock.  The  Stockholders  collectively  are  and  will be
immediately  prior to the Effective Time the record and beneficial owners of all
the issued and outstanding  Company Common Stock,  in such  respective  amounts.
Except for pledges by the  Stockholders  made in connection with the purchase of
Patrick  Luckett's  shares (whose  consent is necessary to permit receipt of the
Merger Consideration), the Company Common Stock held by the Stockholders is free
and clear of all  Encumbrances.  Each outstanding  share of Company Common Stock
has been legally and validly issued and is fully paid and nonassessable, and was
issued pursuant to a valid exemption from registration  under (i) the Securities
Act of 1933,  as amended,  and (ii) all  applicable  state  securities  laws. No
shares of Company  Common Stock are owned by the Company in treasury.  No shares
of Company Common Stock have been issued or disposed

                                       10

<PAGE>



of in violation of any  preemptive  rights,  rights of first  refusal or similar
rights of any of the Stockholders.  Other than Company Common Stock, the Company
has no securities,  bonds, debentures, notes or other obligations the holders of
which  have the  right  to vote  (or are  convertible  into or  exercisable  for
securities having the right to vote) with the Stockholders on any matter.

     Section 3.5.  Transactions in Capital Stock. There exist no Company Rights.
The Company has no obligation  (contingent or otherwise) to purchase,  redeem or
otherwise  acquire any of its equity  securities or any interests  therein or to
pay any dividend or make any distribution in respect thereof. Neither the equity
structure of the Company nor the  relative  ownership of shares among any of its
Stockholders  has been altered or changed in  contemplation of the Merger within
the two years preceding the date of this Agreement.

     Section  3.6.  Continuity  of Business  Enterprise.  There has not been any
sale,  distribution  or spin-off of significant  assets of the Company or any of
its  Affiliates  other than in the  ordinary  course of business  within the two
years preceding the date of this Agreement.

     Section  3.7.  Subsidiaries  and  Investments.  The  Company  does not own,
directly  or  indirectly,  any  capital  stock or  other  equity,  ownership  or
proprietary interest in any other corporation,  partnership, association, trust,
joint venture or other entity (each a "Company Subsidiary").

     Section  3.8.  Absence of  Conflicting  Agreements  or  Required  Consents.
Subject to approval of this Agreement and the Merger by the  Stockholders of the
Company and the consent of the payee under the ESOP, the execution, delivery and
performance  by  the  Company  of  this   Agreement  and  any  other   documents
contemplated hereby (with or without the giving of notice, the lapse of time, or
both):  (i) do not require the consent of any governmental or regulatory body or
authority  or any other  third  party  except for such  consents,  for which the
failure to obtain would not result in a Material  Adverse Effect on the Company;
(ii) will not  conflict  with or result in a violation  of any  provision of the
Company's  articles or certificate of  incorporation  or bylaws,  (iii) will not
conflict with,  result in a violation of, or constitute a default under any law,
rule,  ordinance,  regulation  or  any  ruling,  decree,  determination,  award,
judgment, order or injunction of any court or governmental instrumentality which
is  applicable  to the  Company or by which the  Company or its  properties  are
subject  or  bound;  (iv)  will  not  conflict  with,   constitute  grounds  for
termination of, result in a breach of,  constitute a default under,  require any
notice under,  or  accelerate  or modify,  or permit any person to accelerate or
modify,  any  performance  required by the terms of any  agreement,  instrument,
license or permit,  to which the  Company is a party or by which the  Company or
any  of  its   properties  are  subject  or  bound  except  for  such  conflict,
termination,  breach or default,  the  occurrence of which would not result in a
Material  Adverse Effect on the Company;  and (v) except as contemplated by this
Agreement,  will not create any  Encumbrance  or  restriction  upon the  Company
Common Stock or any of the assets or properties of the Company.

     Section 3.9.  Absence of Changes.  Except as permitted or  contemplated  by
this Agreement,  since December 31, 1997, the Company has conducted its business
only in the

                                       11

<PAGE>



ordinary course and has not:

            (a) suffered any change or changes in its working capital, condition
(financial or otherwise), assets, liabilities,  reserves, business or operations
(whether or not covered by insurance) that  individually or in the aggregate has
had or could  reasonably  be expected to have a Material  Adverse  Effect on the
Company;

            (b) paid, discharged or satisfied any material liability, other than
the payment,  discharge or satisfaction of liabilities in the ordinary course of
business;

            (c)  written  off  as  uncollectible  any  receivable,   except  for
write-offs in the ordinary course of business;

            (d) except in the ordinary  course of business and  consistent  with
past practice, canceled or compromised any debts or waived or permitted to lapse
any claims or rights or sold,  transferred  or otherwise  disposed of any of its
properties or assets;

            (e) entered into any commitment or  transaction  not in the ordinary
course of business  that is material to the Company,  taken as a whole,  or made
any capital expenditure or commitment in excess of $25,000;

            (f) made any  change  in any  method  of  accounting  or  accounting
practice, credit practices, collection policies, or payment policies;

            (g) except in the ordinary  course of business  consistent with past
practice,  incurred  any  liabilities  or  obligations  (absolute,   accrued  or
contingent) in excess of $10,000 individually or $25,000 in the aggregate;

            (h) mortgaged,  pledged,  subjected or agreed to subject, any of its
assets,  tangible or intangible,  to any claim or Encumbrance,  except for liens
for current  personal  property  taxes not yet due and  payable  for  mechanics,
landlords,  materialmen,  and other  statutory  liens,  purchase  money security
interests,  sale-leaseback  interests granted and all other Encumbrances granted
in similar transactions;

            (i) sold, redeemed,  acquired or otherwise transferred any equity or
other interest in itself;

            (j) increased any salaries,  wages or any employee  benefits for any
employee  of the  Company,  except  in  the  ordinary  course  of  business  and
consistent with past practice;

            (k) hired,  committed to hire or terminated  any employee  except in
the ordinary course of business;

            (l)  declared,  set aside or made any  payments,  dividends or other
distributions  to any  Stockholder  or any other holder of capital  stock of the
Company (except as expressly contemplated in this Agreement); or

            (m)  agreed,  whether in writing  or  otherwise,  to take any action
described in this Section 3.9.

     Section 3.10.  No  Undisclosed  Liabilities.  The Company does not have any
liabilities or obligations of any nature, whether accrued, absolute,  contingent
or otherwise, asserted or

                                       12

<PAGE>



unasserted  except for liabilities or obligations  reflected or reserved against
in the Company's Current Balance Sheet.

     Section  3.11.  Litigation  and  Claims.  There  are no  claims,  lawsuits,
actions,  arbitrations,   administrative  or  other  proceedings,   governmental
investigations  or  inquiries  pending  or,  to the  knowledge  of the  Company,
threatened  against,  or affecting  the  Company,  any Company  Subsidiary,  any
Stockholder or any licensed professional or other individual affiliated with the
Company  affecting  or that would  reasonably  be likely to affect  the  Company
Common Stock or the operations, business condition, (financial or otherwise), or
results of operations of the Company which (i) if successful,  may, individually
or in the aggregate, have a Material Adverse Effect on the Company or (ii) could
adversely affect the ability of the Company or any Company  Subsidiary to effect
the transactions  contemplated hereby, and to the knowledge of the Company there
is no basis for any such action or any state of facts or occurrence of any event
which would  reasonably  be likely to give rise to the  foregoing.  There are no
unsatisfied  judgments  against  the Company or any  Company  Subsidiary  or any
licensed  professional  or other  individual  affiliated with the Company or any
Company Subsidiary relating to services provided on behalf of the Company or any
Company  Subsidiary  or any  consent  decrees to which any of the  foregoing  is
subject.  Each of the  matters,  if any, set forth in this Section 3.11 is fully
covered by policies of insurance of the Company or any Company  Subsidiary as in
effect on the date hereof.

     Section  3.12.  No  Violation  of Law.  Neither the Company nor any Company
Subsidiary  has been,  nor shall be as of the  Effective  Time (by virtue of any
action,  omission to act,  contract to which it is a party or any  occurrence or
state of facts  whatsoever),  in violation  of any  applicable  local,  state or
Federal law, ordinance,  regulation,  order,  injunction or decree, or any other
requirement of any governmental body, agency,  authority or court binding on it,
or relating to its properties,  assets or business or its advertising,  sales or
pricing  practices,   except  for  violations  which,  individually  or  in  the
aggregate, would not reasonably be expected to have a Material Adverse Effect on
the Company.

     Section 3.13. Lease  Agreements.  The Disclosure  Schedules contain a true,
accurate and complete list of all the lease agreements and license agreements to
which the Company or any Company Subsidiary is a party and pursuant to which the
Company  or any  Company  Subsidiary  leases  (whether  as lessor or  lessee) or
licenses (whether as licensor or licensee) any real or personal property related
to the  operation  of its  business  and which  requires  payments  in excess of
$12,000 per year (the "Lease Agreements").  The Company has delivered to Tatonka
true and complete copies of all of the Lease Agreements. Each Lease Agreement is
valid,  effective and in full force in accordance  with its terms,  and there is
not under any such lease (i) any  existing  or claimed  material  default by the
Company or any Company  Subsidiary (as applicable) or event of material  default
or event  which  with  notice  or lapse of time,  or both,  would  constitute  a
material  default by the Company or any Company  Subsidiary (as applicable) and,
individually or in the aggregate,  may reasonably  result in a Material  Adverse
Effect on the Company,  or, (ii) to the  knowledge of the Company,  any existing
material  default by any other  party under any of the Lease  Agreements  or any
event of material  default or event which with notice or lapse of time, or both,
would constitute a material default by

                                       13

<PAGE>



any  such  party.  To the  knowledge  of the  Company,  there is no  pending  or
threatened  reassessment of any property  covered by the Lease  Agreements.  The
Company or any Company  Subsidiary  will use  reasonable  good faith  efforts to
obtain,  prior to the  Effective  Time,  the consent of each  landlord or lessor
whose consent is required in connection  with the Merger and will use reasonable
good faith efforts to deliver to Tatonka or Tatonka Sub in writing such consents
as are necessary to effect the Merger.  The Company has a good, clear, valid and
enforceable  leasehold interest under each of the Lease Agreements.  To the best
of the Company's  knowledge,  the Lease Agreements comply with the exceptions to
ownership interests and compensation  arrangements set out in 42 U.S.C.  Section
1395nn, 42 C.F.R.  Section 1001.952,  and any similar  applicable state law safe
harbor or other exemption provisions.

     Section 3.14. Real and Personal Property.

            (a) Neither the Company nor any Company Subsidiary owns any interest
(other than the Lease Agreements) in real property.

            (b) The Company and any Company Subsidiary (i) has good title to all
of its properties and assets (real, personal and mixed, tangible and intangible)
and any rights or interests therein which it purports to own including,  without
limitation,  all the  property  and assets  reflected  in the Company  Financial
Statements;  and (ii) owns such rights, interests,  assets and property free and
clear of all Encumbrances, title defects or objections (except for taxes not yet
due and payable).  The personal  property  presently used in connection with the
operation  of  the  business  of  the  Company  and  the  Company   Subsidiaries
constitutes the necessary  personal property assets to continue operation of the
Company and any Company Subsidiary.

     Section 3.15.  Indebtedness  for Borrowed Money.  Except for trade payables
incurred  in the  ordinary  course of business  or as  reflected  in the Company
Financial Statements or the Disclosure Schedules,  the Company does not have any
direct or indirect  indebtedness for borrowed money,  including  indebtedness by
way of  lease-purchase  arrangements or guarantees,  and is not obligated in any
manner  (actual  or  contingent)  to assume or  guarantee  any  indebtedness  or
obligation of another Person.

     Section 3.16. Contracts and Commitments.

            (a) The Disclosure  Schedules contain a true,  accurate and complete
list, and the Company has delivered to Tatonka true and complete copies, of each
contract,  agreement and other  instrument  requiring the Company to make future
payments of $10,000 in any fiscal year or $25,000 in the  aggregate  (other than
insurance contracts identified in Section 3.22 or Lease Agreements identified in
Section  3.13)  to  which  the  Company  is a party or by which it or any of its
properties or assets are bound including, without limitation, (i) all agreements
between  the  Company,  on the one  hand,  and  any  Payor,  government  entity,
provider,   hospital,  health  maintenance  organization,   other  managed  care
organization or other  third-party  provider,  on the other hand, then in effect
relating to the provision of medical, diagnostic imaging or consulting services,
treatments,  patient referrals or other similar activities, (ii) all indentures,
mortgages, notes, loan or credit agreements and other agreements and obligations

                                       14

<PAGE>



relating to the  borrowing  of money or to the direct or indirect  guarantee  or
assumption of  obligations  of third  parties  requiring the Company to make, or
setting  forth  conditions  under which the  Company  would be required to make,
aggregate  future payments in excess of $10,000 in any fiscal year or $25,000 in
the aggregate,  (iii) all agreements for capital  improvements  or  acquisitions
involving  an amount of $75,000 in any fiscal year or $75,000 in the  aggregate,
(iv) all  agreements  containing a covenant  limiting the freedom of the Company
(or any  provider  employee  of the  Company) to compete in any line of business
with any person or entity or in any geographic area or (v) all written contracts
and  commitments  providing  for  future  payments  by the  Company in excess of
$10,000  in any  fiscal  year or  $25,000  in the  aggregate  and  that  are not
cancelable  by  providing  notice  of 60  days  or  less.  All  such  contracts,
agreements or other instruments are in full force and effect,  there has been no
threatened  cancellation thereof,  there are no outstanding disputes thereunder,
each is with  unrelated  third  parties and was entered  into on an  arms-length
basis and, assuming the receipt of the appropriate  consents,  all will continue
to be  binding  in  accordance  with  their  terms  after  consummation  of  the
transaction  contemplated  in  this  Agreement;  and  there  are  no  contracts,
agreements  or other  instruments  to which the  Company  is a party or is bound
(other than physician  employment contracts and insurance policies) which in any
of the foregoing  events could  singularly  or in the aggregate  have a Material
Adverse  Effect on the value to Tatonka or Tatonka Sub of the Company.  In every
instance where consent is necessary, the Company shall, on or before the Closing
Date,  use  reasonable  good faith  efforts to obtain and  deliver to Tatonka or
Tatonka Sub in writing,  effective as of the Closing Date,  such consents as are
necessary  to enable the  Surviving  Corporation  to enjoy all of the rights now
enjoyed by the Company under such contracts.  Any and all such consents shall be
in a form reasonably  acceptable to Tatonka and shall contain an  acknowledgment
by the  consenting  party that the Company has fully complied with and is not in
default under any provision of the particular  contract or agreement.  Except as
set forth in Schedule 3.16, no contract with a health care provider or Payor has
been materially amended or terminated within the last 12 months.

            (b) The Company (i) has not received notice of any plan or intention
of any other party to exercise  any right to cancel or terminate  any  contract,
agreement or instrument  required to be disclosed  pursuant to Section  3.16(a),
and to the  knowledge of the Company there are no fact(s) that would justify the
exercise  of such a right;  and (ii)  does not  currently  contemplate,  or have
reason to believe any other  Person  currently  contemplates,  any  amendment or
change to any such contract, agreement or instrument.

     Section 3.17. Employee Matters. The Company is not currently a party to any
employment  contract  except for its  employment  contract  with Barker and oral
employment  agreements  which are  terminable at will,  consulting or collective
bargaining contracts, deferred compensation, pension plan (as defined in Section
3(2) of the Employee Retirement Income Security Act of 1974, as amended, and all
rules and  regulations  from  time to time  promulgated  thereunder  ("ERISA")),
profit  sharing,  bonus,  stock  option,  stock  purchase or other  nonqualified
benefit  or  compensation  commitments,  benefit  plans,  arrangements  or plans
(whether  written or oral),  including  all welfare plans (as defined in Section
3(1) of ERISA) of or  pertaining to the Company and any of its present or former
employees,  or any  predecessors  in interest,  except for the ESOP and standard
benefits afforded employees such

                                       15

<PAGE>



as paid vacation,  holiday and sick leave, health, dental,  disability and group
life  insurance,  and  benefits  mandated by Federal or state law for  employees
generally.

     Section 3.18. Labor Relations.

            (a) To the  knowledge  of the  Company,  the  Company is in material
compliance  with  all  applicable  laws  respecting  employment  and  employment
practices,  terms and  conditions of employment,  wages and hours,  occupational
safety and health,  and is not engaged in any unfair labor  practice  within the
meaning of Section 8 of the National Labor Relations Act;

            (b) To the  knowledge  of the  Company,  there  is no  unfair  labor
practice,  charge or complaint or any other employment-related matter against or
involving the Company pending or threatened  before the National Labor Relations
Board or any Federal, state or local agency, authority or court;

            (c)  To  the  knowledge  of  the  Company,  there  are  no  charges,
investigations,    administrative    proceedings   or   formal   complaints   of
discrimination  (including  discrimination  based upon sex, age, marital status,
race,  national  origin,  the making of  workers'  compensation  claims,  sexual
preference,  handicap or veteran status) pending or threatened  before the Equal
Employment Opportunity Commission or any Federal, state or local agency or court
against  the  Company.  There  have  been no  governmental  audits  of the equal
employment  opportunity  practices of the Company  and, to the  knowledge of the
Company,  no basis for any such audit exists which, if conducted would result in
a Material Adverse Effect on the Company;

            (d) The  Company  is in  material  compliance  with the  Immigration
Reform and  Control  Act of 1986,  as amended,  and all  applicable  regulations
promulgated thereunder; and

            (e) To  the  knowledge  of  the  Company,  there  are no  inquiries,
investigations  or  monitoring  activities  of  any  licensed,   registered,  or
certified  professional  personnel  employed or  retained  by,  credentialed  or
privileged,  or otherwise  affiliated  with the Company pending or threatened by
any state  professional board or agency charged with regulating the professional
activities of health care practitioners.

     Section 3.19. Employee Benefit Plans.

            (a) Identification.  The Disclosure Schedules contain a complete and
accurate list of all employee  benefit plans (within the meaning of Section 3(3)
of ERISA) sponsored by the Company or to which the Company contributes on behalf
of its  employees  and  all  employee  benefit  plans  previously  sponsored  or
contributed to on behalf of its employees  within the three years  preceding the
date hereof (the "Employee Benefit Plans").  The Company has provided to Tatonka
copies of all plan documents (as they may have been amended to the date hereof),
determination   letters,   pending  determination  letter  applications,   trust
instruments,  insurance  contracts  or policies  related to an Employee  Benefit
Plan, administrative services contracts,  annual reports,  actuarial valuations,
summary plan descriptions,  summaries of material modifications,  administrative
forms and other  documents  that  constitute  a part of or are  incident  to the
administration  of the Employee  Benefit  Plans.  In  addition,  the Company has
provided or made available to Tatonka a written description of

                                       16

<PAGE>



all  existing  practices  engaged in by the  Company  that  constitute  Employee
Benefit  Plans.  Subject  to the  requirements  of ERISA,  each of the  Employee
Benefit Plans can be  terminated  or amended at will by the Company  without any
further  liability  or  obligation  on the part of such  entity to make  further
contributions or payments in connection therewith following such termination. No
unwritten amendment exists with respect to any Employee Benefit Plan.

            (b) Administration. Each Employee Benefit Plan has been administered
and maintained in compliance with all applicable  laws,  rules and  regulations,
except where the failure to be in compliance  would not,  individually or in the
aggregate, result in a Material Adverse Effect.

            (c)  Examinations.  The Company has not received any notice that any
Employee  Benefit  Plan is  currently  the  subject of an audit,  investigation,
enforcement action or other similar proceeding conducted by any state or Federal
agency or authority.

            (d) Prohibited Transactions.  No prohibited transactions (within the
meaning of Section 4975 of the Code or Section 406 of ERISA) have  occurred with
respect to any Employee Benefit Plan. There has been no breach of any duty under
ERISA  or  applicable  law  (including,  without  limitation,  any  health  care
contractor  requirements  or any other tax law  requirements,  or  conditions to
favorable tax  treatment,  applicable  to such plan),  which would be reasonably
likely to result,  directly or indirectly,  (including through any obligation of
indemnification or contribution),  in any taxes, penalties or other liability to
Tatonka or any of its Affiliates.

            (e)  Claims  and  Litigation.   No  pending  or,  to  the  Company's
knowledge,  threatened, claims, suits or other proceedings exist with respect to
any Employee Benefit Plan other than normal benefit claims filed by participants
or beneficiaries.

            (f)   Qualification.   The   Company   has   received  a   favorable
determination  letter or ruling  from the IRS for each of the  Employee  Benefit
Plans intended to be qualified within the meaning of Section 401(a) or 501(c)(9)
of the Code and/or  tax-exempt  within the meaning of Section 501(a) of the Code
and,  to the  best  knowledge  of the  Company  and each  Stockholder,  has been
continually  qualified  under  the  applicable  Section  of the Code  since  the
Effective Time of such Employee  Benefit Plan. No  proceedings  exist or, to the
Company's knowledge, have been threatened that could result in the revocation of
any such favorable determination letter or ruling.

            (g) Funding Status. No accumulated  funding  deficiency  (within the
meaning of Section 412 of the Code),  whether  waived or  unwaived,  exists with
respect to any Employee  Benefit  Plan or any plan  sponsored by any member of a
controlled  group  (within the meaning of Section  412(n)(6)(B)  of the Code) in
which the  Company  is a member (a  "Controlled  Group").  With  respect to each
Employee Benefit Plan subject to Title IV of ERISA, the assets of each such plan
are at least equal in value to the present value of accrued benefits  determined
on an ongoing basis as of the date hereof. With respect to each Employee Benefit
Plan  described in Section  501(c)(9) of the Code,  the assets of each such plan
are at least equal in value to the present value of accrued benefits, based upon
the most recent  actuarial  valuation as of a date no more than 90 days prior to
the date hereof. The Disclosure

                                       17

<PAGE>



Schedules contain a complete and accurate statement of all actuarial assumptions
applied to determine  the present value of accrued  benefits  under all Employee
Benefit Plans subject to actuarial assumptions.

            (h) Excise Taxes. Neither the Company nor any member of a Controlled
Group has any liability to pay excise taxes with respect to any Employee Benefit
Plan under applicable provisions of the Code or ERISA.

            (i)  Multiemployer  Plans.  Neither  the Company nor any member of a
Controlled  Group is or ever has been obligated to contribute to a multiemployer
plan within the meaning of Section 3(37) of ERISA or any other Employee  Benefit
Plan which has been subject to Title IV of ERISA or Section 412 of the Code.

            (j) PBGC.  No facts or  circumstances  are known to the Company that
would result in the imposition of liability against Tatonka,  Tatonka Sub or any
of its  Affiliates by the Pension  Benefit  Guaranty  Corporation  ("PBGC") as a
result of any act or  omission  by the  Company  or any  member of a  Controlled
Group.  No  reportable  event  (within the meaning of Section 4043 of ERISA) for
which the notice  requirement  has not been waived has occurred  with respect to
any Employee Benefit Plan subject to the requirements of Title IV of ERISA.

            (k) Retirees. The Company has no obligation or commitment to provide
medical,  dental  or  life  insurance  benefits  to or on  behalf  of any of its
employees who may retire or any of its former  employees who have retired except
as may be  required  pursuant to the  continuation  of  coverage  provisions  of
Section 4980B of the Code and the applicable provisions of ERISA.

            (l) Other Compensation Arrangements. Neither the Company nor, to the
Company's  knowledge,  any  Stockholder or Physician  Employee is a party to any
compensation  or debt  arrangement  with any Person relating to the provision of
health care related services other than arrangements with the Company.

     Section 3.20. Environmental Matters.

            (a) Neither the Company nor any Company  Subsidiary  has, within the
five years preceding the date hereof,  through the Effective Time, received from
any Federal,  state or local governmental body, agency,  authority or entity, or
any other Person, any written notice, demand,  citation,  summons,  complaint or
order or any notice of any penalty, lien or assessment,  and to the knowledge of
the Company no investigation  or review is pending by any  governmental  entity,
with respect to any (i) alleged  violation  by the Company of any  Environmental
Law (as defined in subsection (e) below) (ii) alleged  failure by the Company to
have any environmental permit, certificate,  license, approval,  registration or
authorization  required pursuant to any Environmental Law in connection with the
conduct of its business; or (iii) alleged illegal Regulated Activity (as defined
in subsection (e) below) by the Company.

            (b)  Neither  the  Company  nor any  Company  Subsidiary  has  used,
transported,  disposed  of or arranged  for the  disposal of (as those terms are
defined  in  and  construed  under  the  Comprehensive  Environmental  Response,
Compensation and Liability Act) any Hazardous

                                       18

<PAGE>



Substance (as defined in this Agreement) that would be reasonably likely to give
rise to any  Environmental  Liabilities (as defined in subsection (e) below) for
the Company under any applicable Environmental Law that had, or would reasonably
be likely to have, a Material Adverse Effect on the Company. Neither the Company
nor any Company  Subsidiary  has engaged in any  activity or failed to undertake
any activity  which action or failure to act has given,  or would  reasonably be
likely to give, rise to any Environmental  Liabilities or enforcement  action by
any Federal, state or local regulatory agency or authority,  or has resulted, or
would reasonably be likely to result, in any fine or penalty imposed pursuant to
any Environmental Law. Schedule 3.20(b) discloses any known presence of asbestos
in or on the Company's or any Company Subsidiary's owned or leased premises.  To
the  knowledge  of  the  Company,  there  is no  friable  asbestos  in or on the
Company's or any Company Subsidiary's owned or leased premises.

            (c) For the purposes of this Section 3.20, the following  terms have
the following meanings:

            "Environmental  Laws" shall mean any  Federal,  state or local laws,
     ordinances,  codes,  regulations,  rules,  policies  and orders  (including
     without  limitation,  Medical  Waste Laws) that are  intended to assure the
     protection of the  environment,  or that classify,  regulate,  call for the
     remediation  of, require  reporting with respect to, or list or define air,
     water,   groundwater,   solid  waste,  hazardous,   toxic,  or  radioactive
     substances,  materials,  wastes,  pollutants or contaminants,  or which are
     intended  to assure the  safety of  employees,  workers  or other  persons,
     including the public in each case as in effect on the date hereof.

            "Environmental  Liabilities"  shall  mean  all  liabilities  of  the
     Company or any Company  Subsidiary,  whether contingent or fixed, which (i)
     have arisen,  or would reasonably be likely to arise,  under  Environmental
     Laws and (ii)  relate to actions  occurring  or  conditions  existing on or
     prior to the date hereof or the Effective Time.

            "Hazardous Substances" shall mean any toxic or hazardous substances,
     material  or  waste,   including   Medical  Waste,   or  any  pollutant  or
     contaminant, or infectious or radioactive substance or material,  including
     without  limitation,  those substances,  materials and wastes defined in or
     regulated under any Environmental Laws.

            "Regulated Activity" shall mean any generation,  treatment, storage,
     recycling, transportation, disposal or release of any Hazardous Substances.

     Section 3.21. Filing Reports.  All returns,  reports,  plans and filings of
any kind or nature  necessary to be filed by the Company  with any  governmental
agency or authority have been properly  completed and timely filed in compliance
with all applicable requirements, except where failure to so file would not have
a Material Adverse Effect on the Company.

     Section 3.22. Insurance Policies. The Disclosure Schedules list and briefly
describe the Company's policies of insurance to which the Company or any Company
Subsidiary  is a party or under  which the  Company or any  Company  Subsidiary,
officer or director  thereof is or has been  covered at any time during the last
five years preceding the date of this Agreement  relating to the business of the
Company or any Company Subsidiary (the

                                       19

<PAGE>



"Insurance Policies").  All of the Insurance Policies are valid, outstanding and
enforceable  policies,  except  as  may be  limited  by  applicable  bankruptcy,
insolvency  or  similar  laws  affecting  creditors'  rights  generally  or  the
availability  of equitable  remedies and all premiums with respect thereto which
are due and  payable  are  currently  paid.  All  Insurance  Policies  currently
maintained by the Company or any Company Subsidiary  ("Current  Policies") taken
together,  (i) are  believed  to provide  adequate  insurance  coverage  for the
assets,  properties  and  operations of the Company and its  Affiliates  for all
risks normally  insured against by a Person carrying on a substantially  similar
business or businesses as the Company and its  Affiliates,  (ii) are  sufficient
for compliance with legal and  contractual  requirements to which the Company or
any of its Affiliates is a party or by which any of them may be bound, and (iii)
shall  be  maintained  in force  (including  the  payment  of all  premiums  and
compliance  with their  terms)  without  interruption  up to and  including  the
Closing Date. True,  complete and correct copies of all Insurance  Policies have
been provided to Tatonka. Neither the Company nor any Company Subsidiary nor any
officer  or  director   thereof  has  received  any  notice  or  other   written
communication  from any issuer of any  Current  Policy  canceling  such  policy,
materially  increasing  any  deductibles  or  retained  amounts  thereunder,  or
materially  increasing the annual or other premiums  payable  thereunder and, to
the knowledge of the Company,  no such  cancellation or increase of deductibles,
retainages  or  premiums  is  threatened.   There  are  no  outstanding  claims,
settlements  or premiums  owed against any  Insurance  Policy,  and all required
notices  have been  given and all known  potential  or actual  claims  under any
Insurance Policy have been presented in due and timely fashion.  Within the five
years  preceding the Agreement,  neither the Company nor any Company  Subsidiary
has  filed a  written  application  for  any  professional  liability  insurance
coverage which has been denied by an insurance agency or carrier. The Disclosure
Schedules  also set forth a list of all  claims  under any  Insurance  Policy in
excess of $10,000 per occurrence filed by the Company or any Company  Subsidiary
during the immediately preceding three-year period.

     Section 3.23. Licenses, Authorization and Provider Programs.

            (a) The  Company  and each  Physician  Employee  and other  licensed
employee or independent contractor of the Company (i) is the holder of all valid
licenses,  approvals, orders, consents, permits,  registrations,  qualifications
and other rights and authorizations  required by law,  ordinance,  regulation or
ruling of any governmental regulatory authority necessary to operate its/his/her
business  and (ii) is eligible to  participate  in and to receive  reimbursement
under  Titles  XVIII  and XIX of the  Social  Security  Act (the  "Medicare  and
Medicaid  Programs")  and any  other  programs  funded  in  whole  or in part by
Federal,   state  or  local   entities   for  which  the   Company  is  eligible
("Governmental Programs"),  except that the Company has elected not to enroll in
the Medicare and Medicaid  Programs for the current fiscal year. The Company and
the  Stockholders  and each employee who is required to have a provider  number,
has a current  provider  number  for such  Governmental  Programs  and with such
private  non-governmental  programs  (including  without  limitation any private
insurance  program)  under which the  Company is  presently  receiving  payments
directly or indirectly from any Payor for patient care provided by such licensed
employee  or  independent  contractor  (such  non-governmental  programs  called
"Private Programs"). A true, correct and complete list of such licenses, permits
and other authorizations (including, but not limited to

                                       20

<PAGE>



verification  of  Medicare  and  Medicaid  provider  numbers  and  participating
physician  contracts  under 1842(h) of the Social  Security  Act),  and provider
agreements, is set forth in the Disclosure Schedules, true, complete and correct
copies of which have been provided to Tatonka. No violation,  default,  order or
deficiency  exists  with  respect to any of the items  listed in the  Disclosure
Schedules except for such  violations,  defaults,  orders or deficiencies  which
would not be reasonably likely to have a Material Adverse Effect on the Company,
and there is no action pending or to the Company's knowledge  recommended by any
state or  Federal  agencies  having  jurisdiction  over the items  listed in the
Disclosure Schedules, either to revoke, withdraw or suspend any material license
or to terminate the participation of the Company in any Governmental  Program or
Private  Program,  and no event has occurred  which,  with or without  notice or
lapse of time,  or both,  would  constitute  grounds for a  violation,  order or
deficiency  with respect to any of the items listed in the Disclosure  Schedules
to revoke,  withdraw or suspend any material  license to operate its business as
is presently being  conducted by it. To the knowledge of the Company,  there has
been no decision not to renew any existing  agreement with any provider or Payor
relating to the Company's  business as presently  being conducted by it. Neither
the Company nor any licensed  employee  (i) has had  his/her/its  license,  Drug
Enforcement  Agency number,  or  Medicare/Medicaid  provider  status  suspended,
relinquished,  terminated or revoked (including orders that have been entered by
any such entities but stayed), (ii) has been reprimanded in writing,  sentenced,
or  disciplined  by any  licensing  board,  state  agency,  regulatory  body  or
authority,  or Payor  (including  orders  that  have  been  entered  by any such
entities  but  stayed),  or  (iii)  is  the  subject  of  an  initial  or  final
determination  by any Federal or state authority that could result in any demand
or  reimbursement  under the Medicare,  Medicaid or  Government  Programs or any
exclusion or which monetary penalty under Federal or state law or (iv) has had a
final judgment or settlement  entered  against  him/her/it in connection  with a
malpractice or similar action.

            (b) The Company is not required, or for the 72-month period prior to
the Effective  Time was not required,  to file any cost reports or other reports
with any Governmental Program or Private Program.

     Section  3.24.  Inspections  and  Investigations.  Neither the right of the
Company  nor  the  right  of  any  licensed  professional  or  other  individual
affiliated  with  the  Company  to  receive   reimbursements   pursuant  to  any
Governmental  Program  or  Private  Program  has been  terminated  or  otherwise
materially  and adversely  affected as a result of any  investigation  or action
whether by any Federal or state governmental regulatory authority or other third
party. No licensed professional or other individual affiliated with the business
has,  during the past three years prior to the Effective Time, had their license
limited,  suspended  or  revoked by any  governmental  regulatory  authority  or
agency,  integrated  delivery system,  trade association,  review  organization,
accrediting  organization or certifying  agency (including orders that have been
entered by any such entities but stayed).  True,  correct and complete copies of
all reports, correspondence,  notices and other documents relating to any matter
described or referenced in this Section 3.24 have been provided to Tatonka.

     Section 3.25. Proprietary Rights and Information.

                                       21

<PAGE>



            (a) Set forth in the Disclosure Schedules is a complete and accurate
list and summary  description of the following:  (i) all trademarks  (registered
and  unregistered),  trade- names,  service marks and other trade  designations,
including common law rights,  registrations and applications therefor, currently
owned in whole or part, or used by the Company or any Company  Subsidiary,  (ii)
all patents and applications therefor and inventions and discoveries that may be
patentable  currently  owned, in whole or in part, or used by the Company or any
Company Subsidiary,  (iii) all licenses,  royalties,  and assignments thereof to
which the Company or any Company Subsidiary are a party (iv) all copyrights (for
published and  unpublished  works)  currently owned in whole or part, or used by
the Company or any Company Subsidiary and (v) other similar agreements  relating
to the  foregoing  to which the  Company or any  Company  Subsidiary  is a party
(including  expiration  date  if  applicable)  (collectively,  the  "Proprietary
Rights").

            (b) The  Disclosure  Schedules  contain a complete and accurate list
and summary description of all agreements relating to technology, trade secrets,
know-how or  processes  that the Company is  licensed  or  authorized  to use by
others  (other than  technology,  know-how or processes  generally  available to
other health care  providers) or which it licenses or authorizes  others to use,
true, correct and complete copies of which have been provided to Tatonka.  There
are no outstanding and, to the Company's  knowledge,  any threatened disputes or
disagreements with respect to any such agreement.

            (c) The Company  owns or has the legal right to use the  Proprietary
Rights without conflicting with, infringing or violating the rights of any other
Person. No consent of any person will be required for the use thereof by Tatonka
upon  consummation of the transactions  contemplated  hereby and the Proprietary
Rights are freely  transferable.  To the knowledge of the Company,  no claim has
been  asserted  by any person to the  ownership  of or for  infringement  by the
Company of any  Proprietary  Right of any other Person,  and neither the Company
nor any  Stockholder is aware of any valid basis for any such claim. To the best
knowledge of the Company,  no proceedings  have been threatened  which challenge
the  Proprietary  Rights of the Company.  The Company has the right to use, free
and clear of any adverse claims or rights of others, all trade secrets, customer
lists and proprietary  information required for the performance and marketing of
all medical services.

     Section 3.26. Taxes.

            (a) Filing of Tax Returns. The Company has duly and timely filed (in
accordance  with any  extensions  duly granted by the  appropriate  governmental
agency,  if  applicable)  with the  appropriate  governmental  agencies  all Tax
Returns and reports  required to be filed with the United States or any state or
any  political  subdivision  thereof or any foreign  jurisdiction.  All such Tax
Returns or reports are  complete  and  accurate  in all  material  respects  and
properly reflect the taxes of the Company for the periods covered thereby.

            (b)  Payment of Taxes.  Except for such items as the  Company may be
disputing in good faith by proceedings in compliance  with applicable law, which
are  described  in  Schedule  3.26(b),  (i) the  Company  has  paid  all  taxes,
penalties, assessments and interest that have become due with respect to any Tax
Returns that it has filed and has properly accrued on its

                                       22

<PAGE>



books and records in accordance with generally  accepted  accounting  principles
for all of the  same  that  have not yet  become  due and  payable  and (ii) the
Company is not delinquent in the payment of any tax,  assessment or governmental
charge.

            (c) No Pending Deficiencies,  Delinquencies,  Assessments or Audits.
The Company has not received any notice that any tax  deficiency or  delinquency
has been asserted  against the Company and to the best knowledge of the Company,
there is no threat of such assertion.  There is no unpaid  assessment,  proposal
for  additional  taxes,  deficiency or  delinquency in the payment of any of the
taxes of the  Company  that could  reasonably  be likely to be  asserted  by any
taxing authority.  There is no taxing authority audit of the Company pending, or
to the actual knowledge of the Company,  threatened  within the last five years,
and the results of any  completed  audits are properly  reflected in the Company
Financial  Statements.  Except as provided for on the Company Balance Sheet, the
Company has paid all required Federal,  state, or local taxes to the extent that
the same have become due and payable. All Federal, state and local taxes for the
periods  subsequently  to the Company Balance Sheet date have likewise been paid
or  accrued.  There  are no  security  interests  or liens on any  assets of the
Company or any Company  Subsidiary  which have  resulted from any failure to pay
(or alleged failure to pay) taxes.

            (d) No Extension of Limitation  Period.  The Company has not granted
an extension to any taxing authority of the statute of limitation  period during
which any tax liability may be assessed or collected.

            (e) All Withholding  Requirements Satisfied.  All monies required to
be withheld by the Company  and paid to  governmental  agencies  for all income,
social security,  unemployment  insurance,  sales,  excise, use, and other taxes
have  been  collected  or  withheld  and  paid  to the  respective  governmental
agencies.

            (f) Foreign  Person.  Neither the Company nor any  Stockholder  is a
foreign  person,  as such term is referred to in Section  1445(f)(3) of the Code
and Treasury Regulations Section 1.1445-2.

            (g) Safe  Harbor  Lease.  None of the  properties  or  assets of the
Company  constitutes  property  that the  Company,  Tatonka,  Tatonka Sub or any
Affiliate of Tatonka, will be required to treat as being owned by another person
pursuant to the "Safe Harbor Lease"  provisions of Section 168(f)(8) of the Code
prior to repeal by the Tax Equity and Fiscal Responsibility Act of 1982.

            (h) Tax  Exempt  Entity.  None of the  assets or  properties  of the
Company are subject to a lease to a "tax exempt  entity" as such term is defined
in Section 168(h)(2) of the Code.

            (i) Collapsible  Corporation.  The  Company  has  not at  any  time
consented to have the provisions of Section 341(f)(2) of the Code apply to it.

            (j) Boycotts.  The Company has not at any time  participated  in or
cooperated with any international boycott as defined in Section 999 of the Code.

            (k) Parachute Payments.  No payment required or contemplated to be 
made by the

                                       23

<PAGE>



Company  will be  characterized  as an  "excess  parachute  payment"  within the
meaning of Section 280G(b)(1) of the Code.

            (l) S Corporation.  The Company has not made an election to be taxed
as an "S" corporation under Section 1362(a) of the Code.

            (m) Personal Holding Companies. The Company is not or has not been a
personal holding company within the meaning of Section 542 of the Code.

     Section 3.27.  Related Party  Arrangements.  The  Disclosure  Schedules set
forth a  description  of any  interest  held,  directly  or  indirectly,  by any
officer,  director or other  Affiliate of the Company in any  property,  real or
personal  or  mixed,  tangible  or  intangible,  used  in or  pertaining  to the
Company's  business  and any  arrangement  or  agreement  with any  such  person
concerning the provision of goods or services or other matters pertaining to the
Company's  business.  There is no commitment to, and no income  reflected in the
Company  Financial  Statements  that has been derived from,  an  Affiliate,  and
following the Closing the Company  shall not have any  obligation of any kind or
designation to any such Affiliate.

     Section 3.28. Banking Relations. Set forth in the Disclosure Schedules is a
complete and accurate list of all borrowing and investing  arrangements that the
Company  has  with  any bank or other  financial  institution,  indicating  with
respect  to each  relationship  the  type of  arrangement  maintained  (such  as
checking account, borrowing arrangements, safe deposit box, etc.) and the Person
or Persons authorized in respect thereof.

     Section 3.29.  Fraud and Abuse and Self  Referral.  Neither the Company nor
any Company Subsidiary has engaged and, to the knowledge of the Company, neither
the  Company's  officers  and  directors  nor the  Physician  Employees or other
Persons and  entities  providing  professional  services for or on behalf of the
Company have engaged,  in any activities  which are  prohibited  under 42 U.S.C.
Sections  1320a  7,  7a or 7b  or 42  U.S.C.  Section  1395nn  (subject  to  the
exceptions  or safe harbor  provisions  set forth in such  legislation),  or the
regulations  promulgated  thereunder  or  pursuant  to  similar  state  or local
statutes  or  regulations,  or  which  are  prohibited  by  applicable  rules of
professional  conduct or 18 U.S.C.  Sections 24, 287, 371, 664, 669, 1001, 1027,
1035, 1341, 1343, 1347, 1518, 1954, 1956(c)(7)(F) and 3486.

     Section 3.30.  Restrictions  on Business  Activities.  There is no material
agreement,  judgment,  injunction, order or decree binding upon the Company, any
Company  Subsidiary  or  officer,  director  or key  employee  of the Company or
Company Subsidiary, which has or reasonably could be expected to have the effect
of  prohibiting or materially  impairing the current  business of the Company or
any Company  Subsidiary or the continuation of that business in the future,  any
acquisition of property by the Company, any Company Subsidiary or the conduct of
business by the Company or any Company Subsidiary.

     Section  3.31.   Agreements  in  Full  Force  and  Effect.  All  contracts,
agreements,  plans, leases, policies and licenses referred to, or required to be
referred to, in the Company's Disclosure Schedules delivered hereunder are valid
and binding,  and are in full force and effect and are enforceable in accordance
with their  terms,  except to the extent  that the  validity  or  enforceability
thereof may be limited by bankruptcy or other laws affecting the enforcement

                                       24

<PAGE>



of creditors' rights generally,  or by general equity  principles,  or by public
policy.  There is no pending or, to the  knowledge  of the  Company,  threatened
bankruptcy,  insolvency or similar proceeding with respect to any other party to
such  agreements,  and no event has  occurred  which  (whether  with or  without
notice,  lapse of time or the  happening or occurrence of any other event) would
constitute a default thereunder by the Company or any other party thereto.

     Section 3.32.  Statements True and Correct.  No  representation or warranty
made  by the  Company  or  any  Stockholder,  nor  any  statement,  certificate,
information,  exhibit  or  instrument  to be  furnished  by the  Company  or any
Stockholder to Tatonka,  Tatonka Sub or any of their respective  representatives
pursuant to this  Agreement,  contains or will contain as of the Effective  Time
any untrue  statement of material fact or omits or will omit to state a material
fact  necessary  to  make  the  statements  contained  herein  and  therein  not
misleading.

     Section 3.33.  Disclosure  Schedules.  All Disclosure Schedules required by
this Article III are true,  correct and complete in all material  respects as of
the date of this Agreement.

     Section 3.34. Finders' Fees. No investment banker,  broker, finder or other
intermediary  has been  retained by or is  authorized to act on behalf of any of
the  Stockholders  or the Company who is entitled to any fee or commission  upon
consummation of the  transactions  contemplated by this Agreement or referred to
in this Agreement.

                                   ARTICLE IV
                    REPRESENTATIONS AND WARRANTIES OF TATONKA

     As  inducement  to the  Company  and the  Stockholders  to enter  into this
Agreement and to consummate the Merger,  Tatonka  represents and warrants to the
Company and the Stockholders  both as of the date hereof and as of the Effective
Time as follows:

     Section 4.1.  Organization and Good Standing;  Qualification.  Tatonka is a
corporation duly organized, validly existing and in good standing under the laws
of the state of Oklahoma,  with all requisite  corporate  power and authority to
own, operate and lease its assets and properties and to carry on its business as
currently  conducted.  Tatonka is duly  qualified  to do  business  as a foreign
corporation and is in good standing in each jurisdiction  where the character of
the property  owned or leased by it or the nature of its  activities  makes such
qualification necessary, except where such failure to be so qualified or in good
standing  would not have a Material  Adverse  Effect on  Tatonka.  Copies of the
certificate  of  incorporation  and all  amendments  thereto of Tatonka  and the
bylaws of Tatonka,  as amended,  and copies of the corporate  minutes of Tatonka
regarding the Merger and the transactions contemplated hereby, all of which have
been or will be made available to the Company for review,  are true, correct and
complete as in effect on the date of this Agreement and  accurately  reflect all
material  proceedings  of the  stockholders  and  directors  of Tatonka (and all
committees  thereof)  regarding  the  Merger and the  transactions  contemplated
hereby.  The stock  record  books of  Tatonka,  which  have been or will be made
available to the Company for review, contain true, complete and accurate records
of the stock  ownership of Tatonka and the transfer of the shares of its capital
stock.

     Section  4.2.  Authorization  and  Validity.   Tatonka  has  all  requisite
corporate power

                                       25

<PAGE>



to execute and  deliver  this  Agreement  and to  consummate  the Merger and the
transactions  contemplated  hereby.  The execution,  delivery and performance by
Tatonka of this Agreement and the agreements provided for in this Agreement, and
the consummation by Tatonka of the transactions  contemplated hereby and thereby
are  within  Tatonka's  corporate  powers and have been duly  authorized  by all
necessary action on the part of Tatonka's Board of Directors. This Agreement has
been duly  executed by Tatonka.  This  Agreement  and all other  agreements  and
obligations  entered into and  undertaken in connection  with the Merger and the
transactions contemplated hereby to which Tatonka is a party constitute, or upon
execution will constitute,  valid and binding agreements of Tatonka, enforceable
against it in accordance with their respective  terms,  except as may be limited
by bankruptcy or other laws affecting creditors' rights generally, or by general
equity principles, or by public policy.

     Section 4.3.  Governmental  Authorization.  Other than  complying  with the
provisions of the applicable  state corporate laws regarding the approval of the
Merger and the filing of the Articles of Merger and any other required documents
related  to the  Merger,  and other  than  consents,  filings  or  notifications
required to be made or obtained solely by the Company,  the execution,  delivery
and performance by Tatonka of this Agreement and the agreements  provided for in
this  Agreement,  and  the  consummation  of the  Merger  and  the  transactions
contemplated  hereby and thereby by Tatonka  requires no action by or in respect
of, or filing with, any governmental body, agency, official or authority.

     Section  4.4.  Capitalization.  The  authorized  capital  stock of  Tatonka
consists of 50,000,000 shares of Tatonka Common Stock, of which 8,515,556 shares
are issued and outstanding and 1,000,000  shares of Tatonka  Preferred Stock, of
which 135,139 are outstanding.  The most recent  stockholder record in Tatonka's
files  concerning  identities  and holdings of the holders of Tatonka  Preferred
Stock is the "Tatonka  Energy,  Inc.  Preferred Stock Listing"  attached to this
Agreement as Exhibit C. Each outstanding  share of Tatonka Common Stock has been
legally and validly issued and is fully paid and  nonassessable,  and was issued
pursuant to a valid exemption from registration  under (i) the Securities Act of
1933, as amended,  and (ii) all applicable state securities laws.  Tatonka holds
25,000  shares of Tatonka  Common Stock and no other shares of its capital stock
in treasury.

     The Tatonka Preferred Stock was authorized by resolutions adopted and filed
by Sooner Energy Corp. (a Tatonka  predecessor)  with the Registrar of Companies
in British Columbia.  The resolutions fixed the rights and designations of three
series of preferred  stock,  which rights included the  non-cumulative  dividend
rights, preferences upon liquidation,  and rights to convert the preferred stock
into common stock. Sooner was subsequently domesticated as a Wyoming corporation
and then merged into Tatonka, which was the surviving corporation.  The Oklahoma
Certificate  of  Merger  and the Plan  and  Agreement  of  Merger  provided  for
conversion of the Sooner  preferred stock into Tatonka  Preferred Stock, but did
not set forth the rights and  preferences of the Tatonka  Preferred Stock and no
subsequent  amendment to the Tatonka  Certificate of Incorporation  has done so.
Thus,  the rights and  preferences  of the  Tatonka  Preferred  Stock  cannot be
determined  conclusively.   Tatonka  believes  that  an  Oklahoma  court  having
jurisdiction  over the matter would  determine  that the best  evidence of those
rights and preferences is the resolutions fixing the rights and

                                       26

<PAGE>



preferences of the original  preferred stock as authorized and originally issued
in British  Columbia.  Based in part on the foregoing,  Tatonka further believes
that each of the 135,139 shares of Tatonka Preferred Stock currently outstanding
is convertible at the option of the holder thereof into 6.6667 shares of Tatonka
Common  Stock and,  accordingly,  that the 135,139  shares of Tatonka  Preferred
Stock would be convertible into an aggregate of 900,931 shares of Tatonka Common
Stock, as presently  constituted.  Tatonka has delivered  copies of the relevant
British Columbia, Wyoming and Oklahoma documents to the Company.

     No shares of capital  stock of Tatonka  have been  issued or disposed of in
violation of the preemptive rights, rights of first refusal or similar rights of
any stockholders of Tatonka. Except for the preferred stock which is convertible
into shares of Tatonka Common Stock, Tatonka has no bonds, debentures,  notes or
other  obligations  the  holders  of  which  have  the  right  to  vote  (or are
convertible  into or exercisable  for securities  having the right to vote) with
the  stockholders  of Tatonka on any matter.  There exist no options,  warrants,
subscriptions,  calls,  commitments  or other rights to purchase,  or securities
convertible  into or  exchangeable  for, any of the  authorized  or  outstanding
securities of Tatonka and no option, warrant, subscription,  call, or commitment
or commission  right of any kind exists which obligates  Tatonka to issue any of
its  authorized but unissued  capital  stock,  except for options that are to be
issued to George C. Barker,  Joe Foor and Joe R. Love  following  the  Effective
Time. Tatonka has no obligation (contingent or otherwise) to purchase, redeem or
otherwise  acquire any of its equity  securities or any interests  therein or to
pay any dividend or make any distribution in respect thereof.

     Section 4.5. Absence of Conflicting  Agreements or Required  Consents.  The
execution,  delivery and  performance of this Agreement by Tatonka and any other
documents  contemplated  hereby (with or without the giving of notice, the lapse
of time,  or both):  (i) does not  require the  consent of any  governmental  or
regulatory  body or authority or any other third party except for such consents,
for which the failure to obtain would not result in a Material Adverse Effect on
Tatonka;  (ii) will not conflict with any provision of Tatonka's  certificate of
incorporation or bylaws; (iii) will not conflict with, result in a violation of,
or constitute a default under any law, ordinance,  regulation, ruling, judgment,
order or  injunction  of any  court  or  governmental  instrumentality  to which
Tatonka is a party or by which Tatonka or its  properties  are subject or bound;
(iv) will not conflict with,  constitute grounds for termination of, result in a
breach of,  constitute a default under,  require any notice under, or accelerate
or permit  the  acceleration  of any  performance  required  by the terms of any
agreement, instrument, license or permit, material to this transaction, to which
Tatonka is a party or by which Tatonka or any of its properties are bound except
for such conflict, termination, breach or default, the occurrence of which would
not result in a Material Adverse Effect on Tatonka;  and (v) will not create any
Encumbrance  or  restriction  upon Tatonka  Common Stock or any of the assets or
properties of Tatonka. The financial statements of Tatonka contained in the Form
10-K for the year ended December 31, 1996, and in the Form 10-Qs for the periods
subsequent  thereto (a) have been prepared in accordance with generally accepted
accounting  principles  consistently applied (except as may be indicated therein
or in the notes thereto),  (b) present fairly the financial  position of Tatonka
and  Tatonka  Subsidiaries  as of the dates  indicated  and  present  fairly the
results of Tatonka's and Tatonka

                                       27

<PAGE>



Subsidiaries'  operations for the periods then ended,  and (c) are in accordance
with the books and records of Tatonka and Tatonka Subsidiaries,  which have been
properly maintained and are complete and correct in all material respects.

     Section 4.6.  Absence of Changes.  Except as permitted or  contemplated  by
this Agreement,  since September 30, 1997,  there has not been (i) any change in
the working capital,  condition (financial or otherwise),  assets,  liabilities,
reserves, business or operations of Tatonka that has had or is reasonably likely
to have a Material Adverse Effect on Tatonka;  or (ii) any declaration,  setting
aside or payment of any dividend or other  distribution  (whether in cash, stock
or property) with respect to the Tatonka Common Stock.

     Section 4.7. No  Undisclosed  Liabilities.  Except as reflected or reserved
for in  Tatonka's  Current  Balance  Sheet,  Tatonka  does not have any material
liability or obligation  accrued,  contingent  or otherwise,  that is reasonably
likely to have a Material Adverse Effect on Tatonka.

     Section 4.8. Litigation and Claims. There are no claims, lawsuits, actions,
arbitrations,  administrative or other proceedings,  governmental investigations
or inquiries  pending or, to the knowledge of Tatonka,  threatened  against,  or
affecting  Tatonka.  There are no unsatisfied  judgments  against Tatonka or any
consent  decrees to which Tatonka is subject.  Each of the matters,  if any, set
forth in the Disclosure  Schedules are fully covered by policies of insurance of
Tatonka as in effect on that date.

     Section 4.9. No Violation of Law.  Tatonka has not been, nor shall be as of
the Effective Time (by virtue of any action,  omission to act, contract to which
it is a party or any occurrence or state of facts  whatsoever),  in violation of
any  applicable  local,  state or Federal  law,  ordinance,  regulation,  order,
injunction or decree, or any other requirement of any governmental  body, agency
or authority or court  binding on it, or relating to its property or business or
its advertising, sales or pricing practices, except for violations which are not
reasonably likely,  individually or in the aggregate, to have a Material Adverse
Effect on Tatonka.

     Section  4.10.  Employee  Matters.  Except as set  forth in the  Disclosure
Schedules, Tatonka does not have any material arrangements,  agreements or plans
with any person  with  respect to the  employment  by Tatonka of such  person or
whereby such person is to serve as an officer or director of Tatonka.

     Section 4.11. Taxes.

            (a) Filing of Tax  Returns.  Tatonka  has duly and timely  filed (in
accordance  with any  extensions  duly granted by the  appropriate  governmental
agency,  if  applicable)  with the  appropriate  governmental  agencies  all Tax
Returns and reports  required to be filed with the United States or any state or
any  political  subdivision  thereof or any foreign  jurisdiction.  All such Tax
Returns or reports are  complete  and  accurate  in all  material  respects  and
properly reflect the taxes of Tatonka for the periods covered thereby.

            (b)  Payment  of Taxes.  Except  for such  items as  Tatonka  may be
disputing in good faith by proceedings in compliance  with applicable law, which
are described in Schedule

                                       28

<PAGE>



4.11(b),  (i) Tatonka has paid all taxes,  penalties,  assessments  and interest
that have become due with  respect to any Tax Returns  that it has filed and has
properly  accrued on its books and records for all of the same that have not yet
become  due and  (ii)  Tatonka  is not  delinquent  in the  payment  of any tax,
assessment or governmental charge.

            (c) No Pending Deficiencies,  Delinquencies,  Assessments or Audits.
Tatonka has not received any notice that any tax deficiency or  delinquency  has
been  asserted  against  Tatonka.  There is no unpaid  assessment,  proposal for
additional  taxes,  deficiency or delinquency in the payment of any of the taxes
of Tatonka  that could be asserted by any taxing  authority.  There is no taxing
authority audit of Tatonka pending, or to the knowledge of Tatonka,  threatened,
and the results of any completed audits are properly  reflected in the financial
statements of Tatonka.  To the best of its  knowledge,  Tatonka has not violated
any Federal, state, local or foreign tax law.

            (d) No Extension of  Limitation  Period.  Tatonka has not granted an
extension to any taxing authority of the limitation  period during which any tax
liability may be assessed or collected.

            (e) All Withholding  Requirements Satisfied.  All monies required to
be withheld by Tatonka and paid to governmental  agencies for all income, social
security,  unemployment insurance, sales, excise, use, and other taxes have been
collected or withheld and paid to the respective governmental agencies.

            (f)  Foreign  Person.  Neither  Tatonka  nor any  holders of Tatonka
Common  Stock is a  foreign  person,  as such  term is  referred  to in  Section
1445(f)(3) of the Code.

            (g) Tax Exempt Entity.  None of the assets of Tatonka are subject to
a lease to a "tax exempt entity" as such term is defined in Section 168(h)(2) of
the Code.

            (h) Collapsible Corporation.  Tatonka has not at any time consented,
and the holders of Tatonka  Common  Stock will not permit  Tatonka to elect,  to
have the provisions of Section 341(f)(2) of the Code apply to it.

            (i)  Boycotts.  Tatonka  has  not at  any  time  participated  in or
cooperated with any international boycott as defined in Section 999 of the Code.

            (j) Parachute  Payments.  No payment  required or contemplated to be
made by Tatonka will be  characterized as an "excess  parachute  payment" within
the meaning of Section 280G(b)(1) of the Code.

            (k) S  Corporation.  Tatonka has not made an election to be taxed as
an "S" corporation under Section 1362(a) of the Code.

            (l)  Personal  Holding  Companies.  Tatonka is not or has not been a
personal holding company within the meaning of Section 542 of the Code.

     Section  4.12.  Related  Party  Arrangements.  Schedule  4.12 sets  forth a
description  of any  interest  held,  directly or  indirectly,  by any  officer,
director  or other  Affiliate  of Tatonka in any  property,  real or personal or
mixed,  tangible or intangible,  used in or pertaining to Tatonka's business and
any arrangement or agreement with any such person concerning the

                                       29

<PAGE>



provision  of goods  or  services  or  other  matters  pertaining  to  Tatonka's
business.

     Section 4.13.  Statements True and Correct.  No  representation or warranty
made in this Agreement by Tatonka, nor any statement, certificate,  information,
exhibit or instrument to be furnished by Tatonka to the Company or a Stockholder
pursuant to this  Agreement,  contains or will contain as of the Effective  Time
any untrue  statement of material fact or omits or will omit to state a material
fact  necessary  to  make  the  statements  contained  herein  and  therein  not
misleading.

     Section 4.14.  Disclosure  Schedules.  All Disclosure Schedules required by
Article IV hereof and  attached  hereto are true,  correct  and  complete in all
material respects as of the date of this Agreement.

     Section 4.15. Finder's Fees. No investment banker,  broker, finder or other
intermediary  has been  retained by or is authorized to act on behalf of Tatonka
who is entitled to any fee or commission upon  consummation of the  transactions
contemplated by this Agreement or referred to herein.

                                    ARTICLE V
        CLOSING DATE REPRESENTATIONS AND WARRANTIES REGARDING TATONKA SUB

     Tatonka and Tatonka Sub, jointly and severally,  represent and warrant that
the  following  will be true and correct on the Closing  Date as if made on that
date:

     Section  5.1.  Authorization  and  Validity.  The  execution,  delivery and
performance  by  Tatonka  Sub of  this  Agreement  and the  consummation  of the
transactions  contemplated  thereby,  have been duly  authorized by Tatonka Sub.
This  Agreement  will be as of the Closing Date duly  executed and  delivered by
Tatonka  Sub and will  constitute  the legal,  valid and binding  obligation  of
Tatonka Sub  enforceable  against  Tatonka Sub in accordance with its respective
terms, except as may be limited by bankruptcy or other laws affecting creditors'
rights generally, or by equity principles, or by public policy.

     Section 5.2. No Violation.  Neither the execution,  delivery or performance
of this Agreement nor the consummation of the transactions  contemplated  hereby
will conflict with, or result in a violation or breach of the terms,  conditions
or  provisions   of,  or  constitute  a  default  under,   the   certificate  of
incorporation or bylaws of Tatonka Sub.

     Section 5.3. No Business,  Agreements,  Assets or Liabilities.  Tatonka Sub
has not commenced business since its incorporation. Tatonka Sub does not own any
assets (tangible or intangible) other than the  consideration  received upon the
issuance  of  shares of its  capital  stock  and  Tatonka  Sub does not have any
liabilities,  accrued, contingent or otherwise (known or unknown and asserted or
unasserted) other than those assumed pursuant to this Agreement.

                                   ARTICLE VI
                            COVENANTS OF THE COMPANY

     The Company makes the covenants and agreements as set forth in this Article
VI,

                                       30

<PAGE>



which  shall apply with  respect to the period  from this date to the  Effective
Time and, to the extent  contemplated  in this  Agreement,  thereafter and agree
that:

     Section  6.1.  Conduct  of the  Company.  From the date  hereof  until  the
Effective  Time,  the  Company  shall,  in all  material  respects,  conduct its
business in the ordinary and usual course  consistent  with past  practices  and
shall use reasonable efforts to:

            (a) preserve intact its business and its relationships  with Payors,
referral sources, customers,  suppliers,  patients,  employees and others having
business relations with it;

            (b) maintain and keep its  properties  and assets in good repair and
condition  consistent  with past  practice  as is material to the conduct of the
business of the Company;

            (c)   continuously   maintain   insurance   coverage   substantially
equivalent  to the  insurance  coverage  in  existence  on the date  hereof.  In
addition, without the written consent of Tatonka, the Company shall not:

            (1) amend its articles or certificate of incorporation or bylaws, or
     other charter documents;

            (2) issue,  sell or authorize  for  issuance or sale,  shares of any
     class of its  securities  (including,  but not  limited to, by way of stock
     split,  dividend,   recapitalization  or  other  reclassification)  or  any
     subscriptions,  options,  warrants,  rights or convertible  securities,  or
     enter into any agreements or commitments of any character  obligating it to
     issue or sell any such securities;

            (3) redeem,  purchase or otherwise acquire,  directly or indirectly,
     any shares of its capital  stock or any  option,  warrant or other right to
     purchase or acquire any such shares;

            (4) declare or pay any  dividend or other  distribution  (whether in
     cash, stock or other property) with respect to its capital stock (except as
     expressly contemplated in this Agreement);

            (5) voluntarily sell, transfer, surrender, abandon or dispose of any
     of its assets or property  rights  (tangible or intangible)  other than the
     sale of inventory,  if any, in the ordinary  course of business  consistent
     with past practices;

            (6) grant or make any mortgage or pledge or subject itself or any of
     its  properties or assets to any lien,  charge or  encumbrance of any kind,
     except liens for taxes not  currently  due and except for liens which arise
     by operation of law;

            (7)  voluntarily  incur or  assume  any  liability  or  indebtedness
     (contingent  or  otherwise),  except in the ordinary  course of business or
     which is reasonably necessary for the conduct of its business;

            (8) make or commit to make any  capital  expenditures  which are not
     reasonably necessary for the conduct of its business;

            (9) grant any  increase  in the  compensation  payable  or to become
     payable to directors,  officers,  consultants or employees other than merit
     increases to employees of the Company who are not  directors or officers of
     the Company, except in the ordinary

                                       31

<PAGE>



     course of business and consistent with past practices;

            (10) change in any manner any accounting principles or methods other
     than  changes  which are  consistent  with  generally  accepted  accounting
     principles;

            (11) enter into any material commitment or transaction other than in
     the ordinary course of business;

            (12) take any action  which could  reasonably  be expected to have a
     Material Adverse Effect on the Company;

            (13)  apply any of its  assets to the  direct or  indirect  payment,
     discharge,  satisfaction  or  reduction of any amount  payable  directly or
     indirectly  to or for the benefit of any  Affiliate of the  Company,  other
     than in the ordinary course and consistent with past practices;

            (14)  agree,  whether  in  writing  or  otherwise,  to do any of the
     foregoing; and

            (15) take any action at the Board of Director or  Stockholder  level
     to (in any way)  amend,  revise or  otherwise  affect  the prior  corporate
     approval  and  effectiveness  of this  Agreement  or any of the  agreements
     attached as exhibits  hereto,  other than as required to  discharge  its or
     their fiduciary duties.

     Section 6.2. Title to Assets;  Indebtedness.  As of the Effective Time, the
Company shall (i) except for sales of assets held as  inventory,  if any, in the
ordinary  course of business prior to the Effective Time and except as otherwise
specifically described in the Disclosure Schedules to this Agreement,  have good
and valid title to all of its assets free and clear of all  Encumbrances  of any
nature  whatsoever,  except for  current  year ad valorem  taxes and liens which
arise by  operation  of law,  and (ii) have no direct or  indirect  indebtedness
except for  indebtedness  disclosed  in the Company  Financial  Statements,  the
Disclosure  Schedules hereto or for normal and recurring accrued  obligations of
the Company arising in connection  with its business  operations in the ordinary
course of business and which arise from the purchase of  merchandise,  supplies,
inventory and services used in connection with the provision of services.

     Section 6.3.  Access.  At all times prior to the Effective Time,  Tatonka's
employees,  attorneys,  accountants,  agents and other authorized and designated
representatives  will be allowed  full access upon  reasonable  prior notice and
during  regular  business  hours (and at such  other  times as the  parties  may
reasonably  agree)  to  the  properties,  books  and  records  of  the  Company,
including,  without limitation,  deeds, title documents,  leases, patient lists,
insurance  policies,  minute books,  share certificate  books,  share registers,
accounts,  tax returns,  financial  statements  and all other data that,  in the
reasonable   opinion  of  Tatonka,   are  required  for  Tatonka  to  make  such
investigation  as it may desire of the  properties  and business of the Company.
Tatonka  shall also be allowed  full access  upon  reasonable  prior  notice and
during  regular  business  hours (and at such  other  times as the  parties  may
reasonably agree) to consult with the officers, employees (after announcement by
the Company of the Merger to its employees which shall occur no later than three
days subsequent to execution  hereof by the Company),  accountants,  counsel and
agents of the

                                       32

<PAGE>



Company in connection with such  investigation of the properties and business of
the Company.  No investigation by Tatonka shall diminish or otherwise affect any
of the representations, warranties, covenants or agreements of the Company under
this  Agreement.  Any access or  investigation  referred to in this  Section 6.3
shall be  conducted  in such a  manner  as to  minimize  the  disruption  to the
Company's ongoing business operations.

     Section 6.4. Acquisition Proposals.  The Company shall not, and shall cause
each  of its  directors,  officers,  employees  or  agents  not to  directly  or
indirectly:

            (a) solicit, initiate,  encourage or participate in any negotiations
or  discussions  with  respect  to any offer or  proposal  to  acquire  all or a
substantial portion of the business, properties or capital stock of the Company,
whether by merger, consolidation, share exchange, business combination, purchase
of assets or otherwise; or

            (b) except as  required  by law or  pursuant  to  subpoena  or court
order, disclose to any Person, other than Tatonka or its agents, any information
not  customarily  disclosed  concerning  the  business,   assets,   liabilities,
properties  and personnel of the Company,  or, without  Tatonka's  prior written
approval,  afford to any Person other than Tatonka and its agents  access to the
properties,  books or records of the Company.  If the Company receives any offer
or proposal after the date hereof, written or otherwise, of the type referred to
above,  the Company  shall  promptly  inform  Tatonka of such offer or proposal,
decline  such offer and  furnish  Tatonka  with a copy  thereof if such offer or
proposal is in writing.

     Section 6.5. Compliance With Obligations.  Prior to the Effective Time, the
Company shall comply in all material  respects with (i) all applicable  Federal,
state,  local  and  foreign  laws,  rules  and  regulations;  (ii) all  material
agreements   and   obligations,   including  its  articles  or   certificate  of
incorporation or charter documents,  by which it or its properties or its assets
(real,  personal or mixed,  tangible or intangible) may be bound;  and (iii) all
decrees, orders, writs, injunctions,  judgments, statutes, rules and regulations
applicable to the Company, and its respective properties or assets.

     Section 6.6.  Notice of Certain  Events.  The Company shall promptly notify
Tatonka of:

            (a) any  notice  or other  communication  from any  Person or entity
alleging  that the  consent of such  Person or entity is or may be  required  in
connection with the transactions contemplated by this Agreement;

            (b) any employment of any new non-hourly employee by the Company who
is expected to receive annualized compensation of at least $50,000 in 1998;

            (c) any  termination  of  employment  by,  or  threat  to  terminate
employment  received from, any salaried or non-hourly,  skilled  employee of the
Company;

            (d) any  notice  or other  communication  from any  governmental  or
regulatory agency or authority in connection with the transactions  contemplated
by this Agreement;

            (e)  any  actions,  suits,  claims,  investigations  or  proceedings
commenced or threatened against, relating to or involving or otherwise affecting
the Company which, if

                                       33

<PAGE>



pending on the date of this  Agreement,  would have been  required  to have been
disclosed  to  Tatonka  hereunder  or which  relate to the  consummation  of the
transactions contemplated by this Agreement;

            (f) any  material  adverse  change in the  operation of the Company,
including but not limited to any  licensure or  certification  deficiencies,  or
violations;  limitations  on  a  license  or a  provider  agreement;  freeze  or
reduction  in Medicare  or  Medicaid  rates,  notice of  overpayment;  being the
subject of any investigation relating to patient abuse, fraud, kickbacks,  false
claims or other  alleged  illegal  payment  practices  under the Fraud and Abuse
Statutes; and

            (g)  any  notice  or  other  communication   indicating  a  material
deterioration in the relationship  with any Payor or supplier or key employee of
the Company and, if requested by Tatonka, will exert its reasonable best efforts
to restore the relationship.

     Section 6.7.  Stockholders' Consent. The Company shall obtain the unanimous
approval of the  Stockholders  to the Merger.  In obtaining  the approval of the
Stockholders,  the Company shall provide each  Stockholder with such information
as may be required by applicable law or as Tatonka shall deem  appropriate.  The
Board of Directors of the Company shall  recommend the approval of the Merger by
the Stockholders of the Company.

     Section 6.8. Obligations of Company and Stockholders. The Stockholders will
take all  action  reasonably  necessary  to cause the  Company  to  perform  its
obligations  under this  Agreement and all related  agreements and to consummate
the Merger and other transactions  contemplated  hereby and thereby on the terms
and  conditions  set  forth in this  Agreement  and such  agreements;  provided,
however,  that  this  covenant  shall  not  require  the  Company  to  make  any
expenditures  that are not  expressly  set forth in this  Agreement or otherwise
contemplated in this Agreement.

     Section 6.9. Accounting and Tax Matters. The Company will not change in any
material  respect the  accounting  methods or practices  followed by the Company
(including any material  change in any assumption  underlying,  or any method of
calculating,  any bad  debt,  contingency  or other  reserve),  except as may be
required by generally accepted accounting principles.  The Company will not make
any material tax election except in the ordinary  course of business  consistent
with past practice, change any material tax election already made, adopt any tax
accounting method except in the ordinary course of business consistent with past
practice,  change any tax accounting  method,  enter into any closing agreement,
settle any tax claim or  assessment or consent to any tax claim or assessment or
any waiver of the statute of limitations  for any such claim or assessment.  The
Company will duly,  accurately and timely  (without  regard to any extensions of
time) file all returns,  information  statements and other documents relating to
taxes of the Company  required to be filed by it, and pay all taxes  required to
be paid by it, on or before the Closing Date.

                                   ARTICLE VII
                      COVENANTS OF TATONKA AND TATONKA SUB

     Tatonka  and  Tatonka  Sub  agrees  that  between  the date  hereof and the
Closing:

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<PAGE>



     Section 7.1.  Consummation of Agreement.  Tatonka and Tatonka Sub will take
all action  reasonably  necessary to cause the  consummation of the transactions
contemplated  hereby in accordance  with their terms and conditions and take all
corporate and other action necessary to approve the Merger;  provided,  however,
that this  covenant  shall  not  require  Tatonka  and  Tatonka  Sub to make any
expenditures  that are not  expressly  set forth in this  Agreement or otherwise
contemplated in this Agreement.

     Section 7.2.  Requirements to Effect the Merger and  Acquisitions.  Tatonka
and Tatonka  Sub will use its best  efforts to take,  or cause to be taken,  all
actions  necessary to effect the Merger under applicable law,  including without
limitation the filing with the appropriate government officials of all necessary
documents in form approved by counsel for the parties to this Agreement.

     Section 7.3.  Access.  Tatonka and Tatonka Sub shall,  at reasonable  times
during normal  business hours and on reasonable  notice,  permit the Company and
its authorized  representatives  of the Company  reasonable  access to, and make
available for inspection,  all of the assets and business of Tatonka and Tatonka
Sub, including its executive officers, and permit the Company and its authorized
representatives  to inspect and, at the Company's  sole expense,  make copies of
all documents,  records and  information  with respect to the affairs of Tatonka
and Tatonka Sub as the Company and its  representatives  may reasonably request,
all for the sole purpose of permitting  the Company to become  familiar with the
business and assets and liabilities of Tatonka and Tatonka Sub. No investigation
by the Company or the Stockholders shall diminish or otherwise affect any of the
representations,  warranties,  covenants  or  agreements  of Tatonka  under this
Agreement.

     Section 7.4. Notification of Certain Matters. Tatonka and Tatonka Sub shall
promptly  inform  the  Company  in  writing  of (a)  any  notice  of,  or  other
communication relating to, a default or event that, with notice or lapse of time
or both, would become a default,  received by Tatonka  subsequent to the date of
this Agreement and prior to the Effective Time under any contract,  agreement or
investment  material  to Tatonka'  and Tatonka  Sub's  condition  (financial  or
otherwise),  operations,  assets,  liabilities  or  business  and to which it is
subject; or (b) any material adverse change in Tatonka's condition (financial or
otherwise), operations, assets, liabilities or business.

                                  ARTICLE VIII
                COVENANTS OF TATONKA, TATONKA SUB AND THE COMPANY

     Tatonka, Tatonka Sub and the Company agree as follows:

     Section 8.1. Filings; Other Action.

            (a) The Company shall  cooperate with Tatonka and Tatonka Sub in the
preparation  of any and all  documents  required  pursuant  to the  transactions
contemplated by this Agreement,  including  documents required to be filed under
Federal or state  securities  laws.  The Company shall  furnish all  information
concerning  the Company as may be reasonably  requested in  connection  with any
such action in a timely manner.

                                       35

<PAGE>



            (b) The Company,  Tatonka and Tatonka Sub each separately  represent
and warrant that (i) in the case of the Company, none of the written information
or documents  supplied or to be supplied by it specifically for inclusion in any
1934 Act filing,  by exhibit or otherwise  and (ii) in the case of Tatonka will,
at the time any 1934 Act filing and each  amendment and supplement  thereto,  is
made,  none of them contain any untrue  statement of a material  fact or omit to
state any material fact  required to be stated  therein or necessary to make the
statements  therein,  in the light of the  circumstances  under  which they were
made,  not  misleading.  The  Company  shall be entitled to review each 1934 Act
filing and each of the  amendments  thereto,  if any,  prior to its filing.  The
Company's  review of the 1934 Act filings shall not diminish or otherwise affect
the  representations,  covenants  and  warranties  of Tatonka  and  Tatonka  Sub
contained in this Agreement.

            (c) The  Company  shall,  upon  request,  furnish  Tatonka  with all
information concerning itself, its subsidiaries,  directors,  officers, partners
and  Stockholders,  and such other  matters as may be  reasonably  requested  by
Tatonka in connection  with the  preparation of the 1934 Act filings and each of
the amendments or supplements thereto, or any other statement, filing, notice or
application  made by or on behalf of each such party or any of its  subsidiaries
to any  governmental  entity  in  connection  with  the  Merger  and  the  other
transactions contemplated by this Agreement.

     Section 8.2. Amendments of Disclosure  Schedules.  Each party hereto agrees
that, with respect to the representations and warranties of such party contained
in this  Agreement,  such party shall have the continuing  obligation  until the
Closing to supplement or amend promptly the Disclosure Schedules with respect to
any  matter  that  would  have  been or would  be  required  to be set  forth or
described  in the  Disclosure  Schedules in order to not  materially  breach any
representation,  warranty or covenant of such party contained in this Agreement;
provided  that  no  amendment  or  supplement  to  a  Disclosure  Schedule  that
constitutes  or  reflects a Material  Adverse  Effect on the Company may be made
unless Tatonka  consents to such  amendment or  supplement,  and no amendment or
supplement  to a Disclosure  Schedule  that  constitutes  or reflects a Material
Adverse  Effect on Tatonka  may be made  unless  the  Company  consents  to such
amendment or  supplement.  For  purposes of this  Agreement,  including  without
limitation  for  purposes of  determining  whether the  conditions  set forth in
Sections 9.1 and 10.1 have been fulfilled, the Disclosure Schedules hereto shall
be deemed to be the Disclosure Schedules as amended or supplemented  pursuant to
this Section 8.2. In the event that the Company  seeks to amend or  supplement a
Disclosure Schedule pursuant to this Section 8.2 and Tatonka does not consent to
such  amendment  or  supplement,  or  Tatonka  seeks to amend  or  supplement  a
Disclosure  Schedule  pursuant to this  Section  8.2,  and the Company  does not
consent,  this  Agreement  shall be deemed  terminated by mutual  consent as set
forth in Section 14.1(a) hereof.

     Section  8.3.  Actions  Contrary  to Stated  Intent.  No party  hereto will
knowingly, either before or after the Merger, take any action that would prevent
the Merger from  qualifying  as a tax-free  merger within the meaning of Section
368 of the Code.

     Section 8.4.  Public  Announcements.  The parties  hereto will consult with
each other before issuing any press release or making any public  statement with
respect to this

                                       36

<PAGE>



Agreement  and  the  transactions  contemplated  hereby  and,  except  as may be
required by  applicable  law,  will not issue any such press release or make any
such public statement prior to such  consultation,  although the foregoing shall
not apply to any disclosure by Tatonka in any filing with the SEC.

     Section  8.5.  Expenses.  Each  party to this  Agreement  shall  be  solely
responsible  for their own fees and expenses  with  respect to the  transactions
contemplated in this Agreement including,  without limitation,  the fees charged
by attorneys,  accountants and financial advisors retained by such parties.  The
fees and expenses  incurred by the Company  shall be paid by the Company in full
immediately   prior  to  the  Closing  and  such  expenses  shall  be  the  sole
responsibility of the Stockholders following the Closing Date and not Tatonka.

     Section  8.6.  Patient  Confidentiality.  Tatonka  shall  agree to keep all
records and  information  regarding the patients of the Company  confidential in
accordance with all applicable laws.

     Section 8.7.  1934 Act Filings.  Tatonka  shall prepare and file a Form 8-K
regarding  the  transactions  covered  by this  Agreement  and take  any  action
required to be taken  under the  applicable  state Blue Sky or other  securities
laws in connection  with the issuance of the shares of Tatonka Common Stock upon
consummation of the Merger.

                                   ARTICLE IX
                 CONDITIONS PRECEDENT OF TATONKA AND TATONKA SUB

     Except as may be waived in writing by Tatonka,  the  obligations of Tatonka
and Tatonka Sub  hereunder  are  subject to the  fulfillment  at or prior to the
Effective Time of each of the following conditions:

     Section  9.1.  Representations  and  Warranties.  The  representations  and
warranties  of the Company  contained  in this  Agreement  and each  Stockholder
contained in the Stockholders  Representation  Letter (as delivered  pursuant to
Section 9.7 hereof)  shall have been true and correct in all  material  respects
when initially made and shall be true and correct in all material respects as of
the Effective Time.

     Section 9.2.  Covenants.  The Company shall have  performed and complied in
all  material  respects  with all  covenants  required by this  Agreement  to be
performed and complied with by the Company prior to the Effective Time.

     Section 9.3.  Proceedings.  No action,  proceeding or order by any court or
governmental  body or agency  shall have been  threatened  orally or in writing,
asserted,  instituted or entered to restrain or prohibit the carrying out of the
transactions contemplated hereby.

     Section 9.4. No Material Adverse Effect.  No Material Adverse Effect on the
Company shall have occurred since December 31, 1997,  whether or not such change
shall have been caused by the  deliberate  act or omission of the Company or any
Stockholder.

     Section 9.5. Government Approvals and Required Consents. The Company, the

                                       37

<PAGE>



Stockholders  and Tatonka  shall have  obtained  all  licenses,  permits and all
necessary government and other third-party approvals and consents required under
any  law,   statements,   rule,   regulation  or  ordinance  to  consummate  the
transactions contemplated by this Agreement.

     Section 9.6. Closing Deliveries. Tatonka shall have received all Disclosure
Schedules, documents, assignments and agreements, duly executed and delivered in
form reasonably satisfactory to Tatonka, referred to in Section 11.1.

     Section 9.7. Stockholder Representation Letter. Each Stockholder shall have
executed  and  delivered  to Tatonka the  Stockholder  Representation  Letter in
substantially the form of Exhibit C.

                                    ARTICLE X
                       CONDITIONS PRECEDENT OF THE COMPANY

     Except as may be waived in writing by the Company,  the  obligations of the
Company  hereunder are subject to  fulfillment at or prior to the Effective Time
of each of the following conditions:

     Section 10.1.  Representations  and  Warranties.  The  representations  and
warranties of Tatonka and Tatonka Sub contained in this Agreement  shall be true
and correct in all material  respects when  initially made and shall be true and
correct in all material respects as of the Effective Time.

     Section 10.2.  Covenants.  Tatonka and Tatonka Sub shall have performed and
complied in all material respects with all covenants and conditions  required by
this  Agreement to be performed  and complied  with by it prior to the Effective
Time.

     Section 10.3. Proceedings.  No action,  proceeding or order by any court or
governmental  body or agency shall have been  threatened  in writing,  asserted,
instituted  or  entered  to  restrain  or  prohibit  the  carrying  out  of  the
transactions contemplated hereby.

     Section 10.4. Government Approvals and Required Consents.  The Company, the
Stockholders,  Tatonka and Tatonka Sub shall have obtained all licenses, permits
and all  necessary  government  and other  third-party  approvals  and  consents
(including the unanimous  consent of the  Stockholders)  required under any law,
contracts or any statute,  rule,  regulation or  ordinances  to  consummate  the
transactions contemplated by this Agreement.

     Section  10.5.  Closing  Deliveries.  The Company  shall have  received all
Disclosure Schedules,  documents,  assignments and agreements, duly executed and
delivered in form reasonably  satisfactory to the Company referred to in Section
11.2.

     Section 10.6. No Material  Adverse  Effect.  No Material  Adverse Effect on
Tatonka or Tatonka Sub shall have occurred since September 30, 1997,  regardless
of whether such change shall have been caused by the  deliberate act or omission
of Tatonka or Tatonka Sub.

                                       38

<PAGE>



                                   ARTICLE XI
                               CLOSING DELIVERIES

     Section 11.1. Deliveries of the Company. At or prior to the Effective Time,
the Company shall deliver to Tatonka the  following,  all of which shall be in a
form reasonably satisfactory to Tatonka:

            (a) a copy of  resolutions  of the Board of Directors of the Company
authorizing  the execution,  delivery and  performance of this Agreement and all
related documents and agreements and consummation of the Merger,  each certified
by the  Secretary  of the  Company  as being  true  and  correct  copies  of the
originals thereof subject to no modifications or amendments;

             (b) a certificate of the President of the Company dated the Closing
Date, as to the truth and correctness of the  representations  and warranties of
the Company contained in this Agreement on and as of the Effective Time;

            (c) a certificate  of the President of the Company dated the Closing
Date, (i) as to the  performance  of and compliance in all material  respects by
the Company  with all  covenants  contained  in this  Agreement on and as of the
Effective Time and (ii) certifying that all conditions precedent required by the
Company to be satisfied shall have been satisfied;

            (d) a certificate  of the Secretary of the Company  certifying as to
the incumbency of the directors and officers of such  corporation  and as to the
signatures of such directors and officers who have executed documents  delivered
at the Closing on behalf of that corporation;

            (e) certificates, dated within ten days prior to the Effective Time,
of the Secretary of State of Texas for the Company  establishing  that each such
corporation is in existence,  has paid all franchise or similar  taxes,  if any,
and, if  applicable,  otherwise is in good standing to transact  business in the
state of Texas;

            (f) certificates, dated within ten days prior to the Effective Time,
of the  Secretaries  of State of the  states  in which  either  the  Company  is
qualified to do business,  to the effect that each such corporation is qualified
to do business and, if applicable,  is in good standing as a foreign corporation
in each of such states;

            (g) all authorizations,  consents,  approvals,  permits and licenses
referenced in Section 3.23;

            (h) the resignations of the directors and officers of the Company as
requested by Tatonka;

             (i)  executed  Articles  of Merger  necessary  to effect the Merger
referred to in Section 2.1;

               (j) such other instrument or instruments of transfer  prepared by
Tatonka as shall be necessary or  appropriate,  as Tatonka or its counsel  shall
reasonably  request,  to carry out and  effect  the  purpose  and intent of this
Agreement.

     Section  11.2.  Deliveries of Tatonka.  At or prior to the Effective  Time,
Tatonka shall

                                       39

<PAGE>



deliver to the Company the following, all of which shall be in a form reasonably
satisfactory to the Company:

            (a) a copy of  resolutions  of the  Board of  Directors  of  Tatonka
authorizing the execution,  delivery and performance of this Agreement,  and all
related documents and agreements, certified by Tatonka's Secretary as being true
and correct  copies of the  originals  thereof  subject to no  modifications  or
amendments;

            (b) a copy of  resolutions  of the Board of Directors of Tatonka Sub
authorizing the execution,  delivery and performance of this Agreement certified
by the  Secretary of Tatonka Sub as being true correct  copies of the  originals
thereof subject to no modifications or amendments;

            (c) a certificate  of the President of Tatonka and Tatonka Sub dated
the Closing  Date as to the truth and  correctness  of the  representations  and
warranties of Tatonka and Tatonka Sub  contained in this  Agreement on and as of
the Effective Time;

            (d) a certificate  of the President of Tatonka and Tatonka Sub dated
the Closing Date, (i) as to the performance and compliance by Tatonka or Tatonka
Sub with all  covenants  contained in this  Agreement on and as of the Effective
Time and (ii) certifying that all conditions  precedent required to be satisfied
by Tatonka and Tatonka Sub shall have been satisfied;

            (e) a  certificate  of the  Secretary  of Tatonka  and  Tatonka  Sub
certifying as to the incumbency and to the signatures of the officers of Tatonka
or Tatonka Sub who have executed documents delivered at the Closing on behalf of
Tatonka or Tatonka Sub;

            (f)  a certificate,  dated  within ten days  prior to the  Effective
Time, of the secretary of state of incorporation  establishing  that Tatonka and
Tatonka Sub are, respectively,  in existence, have paid all franchise or similar
taxes,  if any, and otherwise  are in good standing to transact  business in the
states of Oklahoma and Texas;

            (g)  certificates  (or photocopies  thereof),  dated within ten days
prior to the Effective  Time, of the Secretaries of State of the states in which
either  Tatonka and Tatonka Sub is qualified to do business,  to the effect that
Tatonka and Tatonka Sub is qualified to do business and is in good standing as a
foreign corporation in such state;

            (h)  executed  Articles  of Merger  necessary  to effect the Merger
referred to in Section 2.1;

            (i)  the  Merger Consideration  in  accordance  with  Article II and
Exhibit A hereof; and

            (j)such other instrument or instruments of transfer prepared by the
Company as shall be  necessary  or  appropriate,  as the  Company or its counsel
shall reasonably request, to carry out and effect the purpose and intent of this
Agreement.

                                   ARTICLE XII
                              POST CLOSING MATTERS

     Section 12.1. Further  Instruments of Transfer.  Following the Closing,  at
the request

                                       40

<PAGE>



of Tatonka or the Surviving  Corporation and at Tatonka's sole cost and expense,
the  Stockholders  and the Company  shall  deliver any  further  instruments  of
transfer and take all  reasonable  action as may be necessary or  appropriate to
carry out the  purpose  and intent of this  Agreement.  Following  the  Closing,
Tatonka or the Surviving  Corporation  shall deliver any further  instruments of
transfer and take all reasonable  action as may be necessary and  appropriate to
carry out the purpose and intent of this Agreement.

     Section 12.2. Merger Tax Covenant.

            (a) The parties  intend  that the Merger will  qualify as a tax-free
merger  within the meaning of Section 368 of the Code in which the Company  will
not  recognize  gain or loss,  and  pursuant to which any gain  recognized  by a
Stockholder  as a result of the  Merger  will not  exceed the amount of any cash
received by a Stockholder in the Merger (a "Reorganization").

            (b) Both  prior to and  after  the  Effective  Time,  all  books and
records shall be maintained,  and all Tax Returns and schedules thereto shall be
filed in a manner  consistent with the Merger being treated as a Reorganization.
These  obligations  are excused as to a party  required to maintain the books or
file a Tax  Return if such  party has  provided  to the other  parties a written
opinion of  competent  tax counsel to the effect  that there is not  substantial
authority, within the meaning of Section 6662(d)(2)(B)(i) of the Code, to report
the Merger as a Reorganization and such opinion either is furnished prior to the
Effective  Time or is based on facts or events not known at the Effective  Time.
Each party  shall  provide to each other  party such tax  information,  reports,
returns,  or  schedules  as may be  reasonably  required to assist such party in
accounting for and reporting the Merger as a Reorganization.

            (c) The parties  agree that no  Stockholder  shall be liable for any
taxes  incurred  by the Company and for which  Tatonka has  successor  liability
therefor which arise solely as a result of the Merger or the consummation of the
transactions contemplated hereby; provided that the foregoing shall not limit or
otherwise be deemed a waiver of any right of indemnification  under Section 13.1
for a breach of any  representation,  warranty or covenant of the Company or any
Stockholder.

     Section  12.3.  Current  Public  Information.  Tatonka  shall  use its best
efforts to cause the  requirements of Rule 144(c) under the Securities Act to be
met with  respect to Tatonka  for so long as those  requirements  must be met to
enable sales by the  Stockholders  who are affiliates of the Company to meet the
requirements of Rule 145(d) under the Securities Act.

     Section 12.4. Change of Tatonka Name. Tatonka shall use its best efforts to
cause Tatonka's name to be changed to "PHYMED,  INC.", or such other name as the
Board of Directors of Tatonka,  in  consultation  with the  Stockholders,  shall
choose,  to reflect  better  the nature of  Tatonka's  business  and  operations
following consummation of the transactions contemplated hereby.

                                  ARTICLE XIII
                                    REMEDIES

     Section 13.1. Indemnification by the Company and the Stockholders.  Subject
to the

                                       41

<PAGE>



terms and  conditions  of this Article  XIII,  the Company and the  Stockholders
agree to indemnify,  defend and hold Tatonka and the Surviving  Corporation  and
their  respective  directors,   officers,   stockholders,   employees,   agents,
attorneys,  consultants  and  Affiliates  harmless  from and against all losses,
claims,  obligations,  demands,  assessments,   penalties,  liabilities,  costs,
damages, reasonable attorneys' fees and expenses (including, without limitation,
all costs of  experts  and all costs  incidental  to or in  connection  with any
appellate  process)  (collectively,  "Damages")  asserted against or incurred by
such individuals and/or entities arising out of or resulting from:

            (a) a breach by the Company or any Stockholder of any representation
or warranty or covenant  of the  Company or any  Stockholder  contained  in this
Agreement or in any Disclosure Schedule or certificate delivered thereunder;

            (b) any violation (or alleged  violation) by the Company  and/or any
of its past or present directors,  officers, partners,  Stockholders,  employees
(including,  without limitation,  any Physician  Employee),  agents,  attorneys,
consultants  and  Affiliates of any state or Federal law  governing  health care
fraud and abuse or  prohibition  on  referral  of patients to Persons in which a
licensed professional has a financial or other form of interest (including,  but
not limited to, fraud and abuse in the Medicare and Medicaid Programs) occurring
on or before the Closing Date,  or any  overpayment  or  obligation  (or alleged
overpayment or obligation)  arising out of or resulting from claims submitted to
any Payor on or before the Closing Date; and

           (c) any liability  under the Securities Act, the  Exchange Act or any
other Federal or state "blue sky" or securities law or regulation, at common law
or otherwise, arising out of or based upon any untrue statement of material fact
in any 1934 Act filing, or any amendment thereof or supplement  thereto relating
to  the  Company  (including  any  Company   Subsidiary)  or  failure  to  state
information  necessary to make the statements  required to be stated therein not
misleading arising solely from information provided in writing to Tatonka or its
counsel by the  Company or any  Stockholder  or their  agents  specifically  for
inclusion in any such 1934 Act filing,  or any  amendment  thereof or supplement
thereto.

     Nothing  contained  in this  Agreement  shall  relieve  the  Company of any
liability  or  limit  any  liability  that it may  have in the  case of fraud in
connection with the transactions contemplated by this Agreement.

     Section 13.2.  Indemnification  by Tatonka and Tatonka Sub.  Subject to the
terms and conditions of this Article XIII,  Tatonka and Tatonka Sub hereby agree
to indemnify,  defend and hold the Stockholders,  the Company and its directors,
officers, stockholders, employees, agents, attorneys, consultants and Affiliates
harmless  from and  against  all  Damages  asserted  against or incurred by such
individuals and/or entities arising out of or resulting from:

            (a) a breach by  Tatonka  or Tatonka  Sub of any  representation  or
warranty  (without  giving  effect  to any  Material  Adverse  Effect  qualifier
contained as part of any such representation or warranty) or covenant of Tatonka
or Tatonka Sub  contained in this  Agreement  or in any schedule or  certificate
delivered hereunder; and

            (b) any liability  under the Securities Act, the Exchange Act or any
other Federal or

                                       42

<PAGE>



state "blue sky" or securities  law or  regulation,  at common law or otherwise,
arising out of or based upon any untrue  statements of material fact in any 1934
Act filing,  or any amendment thereof or supplement  thereto,  or required to be
stated therein or failure to state information  necessary to make the statements
therein  not  misleading  (except  for any  liability  based  upon any actual or
alleged  untrue  statement  of material  fact or an omission to state a material
fact  relating  the  Company  or any  Stockholder  which  was  derived  from any
information provided in writing by the Company or a Company Subsidiary or any of
their agents contained in the  representations  and warranties set forth in this
Agreement or any  certificate,  exhibit,  schedule or instrument  required to be
delivered under this Agreement).

     Nothing  contained in this Agreement shall relieve Tatonka of any liability
or limit any liability that it may have in the case of fraud in connection  with
the transactions contemplated by this Agreement.

     Section 13.3. Conditions of Indemnification. All claims for indemnification
under this Agreement shall be asserted and resolved as follows:

            (a) Any  party  claiming  indemnification  under the  Agreement  (an
"Indemnified  Party") shall promptly (and, in the event, at least ten days prior
to the due date for any responsive  pleadings,  filings or other  documents) (i)
notify the party for whom indemnification is sought (the "Indemnifying Party) of
any third-party  claim or claims asserted against the Indemnified  Party ("Third
Party  Claim")  that  could give rise to a right of  indemnification  under this
Agreement and (ii) transmit to the  Indemnifying  Party a written notice ("Claim
Notice")  describing in reasonable detail the nature of the Third Party Claim, a
copy of all papers  served with  respect to such claim (if any),  an estimate of
the amount of Damages attributable to the Third Party Claim and the basis of the
Indemnified  Party's  request  for  indemnification  under this  Agreement.  The
failure to promptly  deliver a Claim Notice  shall not relieve any  Indemnifying
Party of its  obligations to any  Indemnified  Party with respect to the related
Third Party Claim except to the extent that the  resulting  delay is  materially
prejudicial  to the defense of such claim.  Within 30 days after  receipt of any
Claim Notice (the "Election  Period"),  the Indemnifying  Party shall notify the
Indemnified  Party (x) whether the  Indemnifying  Party  disputes its  potential
liability to the Indemnified  Party under this Article XIII with respect to such
Third Party Claim and (y) whether the  Indemnifying  Party desires,  at the sole
cost and expense of such  Indemnifying  Party, to defend the  Indemnified  Party
against such Third Party Claim.

            (b) If the Indemnifying  Party notifies the Indemnified Party within
the Election Period that the Indemnifying  Party elects to assume the defense of
the Third  Party  Claim,  then the  Indemnifying  Party  shall have the right to
defend, at their sole cost and expense,  with counsel  reasonably  acceptable to
such Indemnified  Party, such Third Party Claim by all appropriate  proceedings,
which proceedings shall be prosecuted  diligently by the Indemnifying Party to a
final  conclusion  or settled at the  discretion  of the  Indemnifying  Party in
accordance  with this Section  13.3(b).  Except as set forth in Section  13.3(f)
below,  the  Indemnifying  Party  shall have full  control of such  defense  and
proceedings,  including any compromise or settlement  thereof.  The  Indemnified
Party is hereby  authorized,  at the sole cost and  expense of the  Indemnifying
Party (but only if the Indemnified Party is entitled to indemnification

                                       43

<PAGE>



hereunder),  to file,  during the Election Period,  any motion,  answer or other
pleadings  that the  Indemnified  Party shall deem  necessary or  appropriate to
protect its interests or those of the Indemnifying  Party and not prejudicial to
the Indemnifying  Party. If requested by the Indemnifying Party, the Indemnified
Party  agrees,  at the sole  cost and  expense  of the  Indemnifying  Party,  to
cooperate with the Indemnifying  Party and their counsel in contesting any Third
Party Claim that the Indemnifying  Party elects to contest,  including,  without
limitation,  the making of any related counterclaim against the person asserting
the Third Party Claim or any cross-complaint against any person. The Indemnified
Party may  participate  in, but not control,  any defense or  settlement  of any
Third Party Claim controlled by the Indemnifying  Party pursuant to this Section
13.3(b)  and  shall  bear  its own  costs  and  expenses  with  respect  to such
participation;  provided,  however, that if the named parties to any such action
(including any impleaded  parties) include both the  Indemnifying  Party and the
Indemnified  Party,  and the Indemnified  Party has been advised by counsel that
there may be one or more legal defenses  available to it that are different from
or additional to those available to the Indemnifying Party, then the Indemnified
Party may employ separate counsel at the expense of the Indemnifying  Party, and
upon written  notification  thereof,  the Indemnifying  Party shall not have the
right to assume the defense of such action on behalf of the  Indemnified  Party;
provided further that the  Indemnifying  Party shall not, in connection with any
one such action or separate but substantially  similar or related actions in the
same jurisdiction  arising out of the same general allegations or circumstances,
be liable for the reasonable fees and expenses of more than one separate firm of
attorneys at any time for the Indemnified  Party, which firm shall be designated
in  writing  by  the  Indemnified  Party.  Notwithstanding  the  foregoing,  the
Indemnifying  Party shall be prohibited from confessing or settling any criminal
allegations  brought against the  Indemnified  Party without the express written
consent of the Indemnified Party.

            (c) If the Indemnifying  Party fails to notify the Indemnified Party
within the  Election  Period that the  Indemnifying  Party  elects to defend the
Indemnified  Party pursuant to Section  13.3(b),  or if the  Indemnifying  Party
elects to defend the  Indemnified  Party  pursuant to Section  13.3(b) but fails
diligently  and promptly to prosecute or settle the Third Party Claim,  then the
Indemnified  Party shall have the right to defend,  at the sole cost and expense
of  the   Indemnifying   Party  (if  the   Indemnified   Party  is  entitled  to
indemnification   hereunder),   the  Third  Party   Claim  by  all   appropriate
proceedings,  which proceedings  shall be promptly and vigorously  prosecuted by
the Indemnified  Party to a final conclusion or settled.  The Indemnified  Party
shall have full control of such defense and proceedings, provided, however, that
the  Indemnified  Party may not enter  into,  without the  Indemnifying  Party's
consent,  which shall not be unreasonably withheld, any compromise or settlement
of such Third Party Claim.  Notwithstanding  the foregoing,  if the Indemnifying
Party has delivered a written notice to the Indemnified Party to the effect that
the  Indemnifying  Party disputes their  potential  liability to the Indemnified
Party under this  Article  XIII and if such  dispute is resolved in favor of the
Indemnifying  Party,  the  Indemnifying  Party shall not be required to bear the
costs and expenses of the Indemnified  Party's defense  pursuant to this Section
or of the Indemnifying Party's  participation therein at the Indemnified Party's
request,  and the Indemnified  Party shall reimburse the  Indemnifying  Party in
full for all costs and expenses of

                                       44

<PAGE>



such litigation. The Indemnifying Party may participate in, but not control, any
defense or  settlement  controlled  by the  Indemnified  Party  pursuant to this
Section  13.3(c),  and the  Indemnifying  Party  shall  bear its own  costs  and
expenses  with respect to such  participation;  provided,  however,  that if the
named parties to any such action (including any impleaded  parties) include both
the Indemnifying Party and the Indemnified Party, and the Indemnifying Party has
been advised by counsel that there may be one or more legal  defenses  available
to it  that  are  different  from  or  additional  to  those  available  to  the
Indemnified  Party, then the Indemnifying  Party may employ separate counsel and
upon written  notification  thereof,  the  Indemnified  Party shall not have the
right to assume the defense of such action on behalf of the Indemnifying Party.

            (d) In the event any  Indemnified  Party should have a claim against
any Indemnifying  Party hereunder that does not involve a Third Party Claim, the
Indemnified Party shall transmit to the Indemnifying Party a written notice (the
"Indemnity  Notice") describing in reasonable detail the nature of the claim, an
estimate  of the amount of damages  attributable  to such claim and the basis of
the Indemnified Party's request for indemnification under this Agreement. If the
Indemnifying Party does not notify the Indemnified Party within 60 days from its
receipt of the Indemnity Notice that the Indemnifying Party disputes such claim,
the claim  specified by the Indemnified  Party in the Indemnity  Notice shall be
deemed a liability of the  Indemnifying  Party  hereunder.  If the  Indemnifying
Party has timely disputed such claim,  as provided above,  such dispute shall be
resolved by litigation in an appropriate court of competent  jurisdiction if the
parties do not reach a settlement of such dispute within 30 days after notice of
a dispute is given.

            (e) Payments of all amounts owing by any Indemnifying Party pursuant
to this  Article  XIII  relating  to a Third Party Claim shall be made within 30
days after the latest of (i) the settlement of such Third Party Claim,  (ii) the
expiration of the period for appeal of a final  adjudication of such Third Party
Claim, or (iii) the expiration of the period for appeal of a final  adjudication
of the  Indemnifying  Party's  liability  to the  Indemnified  Party  under this
Agreement.  Payments of all amounts owing by the Indemnifying  Party pursuant to
Section  13.3(d)  shall  be made  within  30 days  after  the  later  of (i) the
expiration of the 60-day  Indemnity  Notice period or (ii) the expiration of the
period for appeal of a final adjudication of the Indemnifying  Party's liability
to the  Indemnified  Party  under this  Agreement.  During the  two-year  period
following  the Effective  Time,  each  Stockholder  shall be entitled to satisfy
payments  owed to  Tatonka  by  transfer  of  Tatonka  Common  Stock  from  such
Stockholder to Tatonka.  For all purposes of this  Agreement,  the value of each
share of Tatonka Common Stock  transferred to Tatonka pursuant to this Agreement
shall be  calculated by averaging  the daily  closing  prices  (i.e.,  last sale
price,  regular way) for a share of Tatonka  Common Stock for the 20 consecutive
trading  days on which such shares are  actually  traded on the NASDAQ  National
Market System preceding the date of the Claim Notice or Indemnity Notice, as the
case may be, if the  Tatonka  Common  Stock is so  traded  at the  time.  If the
Tatonka Common Stock is not traded on the NASDAQ  National  Market System at the
time,  the average of the high bid and low asked  prices as reported in the Wall
Street  Journal,  or if not so reported,  as furnished by a professional  market
maker  making a market in the Tatonka  Common Stock and selected by the Board of
Directors of Tatonka, shall be used. The rights of any

                                       45

<PAGE>



Stockholder  to  transfer  shares of Tatonka  Common  Stock in  satisfaction  of
payments owed to Tatonka  pursuant to this Agreement  shall terminate at the end
of the two-year period following the Effective Time.

            (f) The Indemnifying  Party shall provide the Indemnified Party with
written  notice of any firm offer that is made to settle or  compromise  a Third
Party Claim against an Indemnified Party. If a firm offer is made to settle such
a claim  solely by the  payment  of money  damages  and the  Indemnifying  Party
notifies the Indemnified Party in writing that the Indemnifying  Party agrees to
such settlement, but the Indemnified Party elects not to accept and agree to it,
the  Indemnified  Party may continue to contest or defend such Third Party Claim
and, in such event,  the total maximum  liability of the  Indemnifying  Party to
indemnify or otherwise reimburse the Indemnified Party hereunder with respect to
such a claim  shall be  limited  to and  shall  not  exceed  the  amount of such
settlement offer, plus reasonable  out-of-pocket  costs and reasonable  expenses
(including  reasonable  attorneys' fees and disbursements) to the date of notice
that the Indemnifying Party desired to accept such settlement.

            (g)  Notwithstanding  anything  contained  in this  Agreement or the
Merger Agreement to the contrary,  the Indemnifying Parties in the aggregate (i)
shall have no  obligation  hereunder  to provide  indemnification  for the first
$50,000 of Damages (without counting  Immaterial  Claims as defined below),  and
(ii) in no event shall the  Indemnifying  Parties have any  liability  hereunder
with respect to any singular incident or a fact involving a breach or inaccuracy
of the Company if the  Damages  from such claim are equal to or less than $7,500
("Immaterial Claims").

     Section  13.4.  Costs,   Expenses  and  Legal  Fees.  Whether  or  not  the
transactions  contemplated hereby are consummated,  each party hereto shall bear
its own costs and expenses  (including  attorneys' fees), except that each party
hereto  agrees to pay the costs and expenses  (including  reasonable  attorneys'
fees and expenses)  incurred by the other parties in successfully  (a) enforcing
any of the terms of this  Agreement or (b) proving that another  party  breached
any of the terms of this Agreement.

     Section 13.5.  Tax Benefits;  Insurance  Proceeds.  The total amount of any
indemnity payments owed by one party to another party to this Agreement shall be
reduced by any correlative  tax benefit  received by the party to be indemnified
or the net  proceeds  received by the party to be  indemnified  with  respect to
recovery  from  third  parties  or  insurance  proceeds,  and  such  correlative
insurance  benefit shall be net of the insurance  premium,  if any, that becomes
due as a result of such claim.

     Section 13.6. Dispute Resolution.

            (a)   Arbitration.   The  parties   hereto  agree  that  any  claim,
controversy, dispute or disagreement between or among any of the parties arising
out of or relating to this Agreement shall be governed  exclusively by the terms
and  provisions of this Section 13.6;  provided,  however,  that within ten days
from the date which any claim,  controversy,  dispute or disagreement  cannot be
resolved  and prior to  commencing  an  arbitration  procedure  pursuant to this
Section 13.6, the parties shall meet to discuss and consider  other  alternative
dispute resolution procedures other than arbitration including,  but not limited
to, mediation. If at any

                                       46

<PAGE>



time prior to the  rendering of the decision by the  arbitrator  (or pursuant to
such other  alternative  dispute  resolution  procedure) as contemplated in this
Section  13.6 to the  extent a party  makes a written  offer to the other  party
proposing a  settlement  of the  matter(s)  at issue and such offer is rejected,
then the party  rejecting  such offer  shall be  obligated  to pay the costs and
expenses  (excluding  the amount of the award granted under the decision) of the
party that offered the settlement  from the date such offer was received by such
other party if the decision is for a dollar  amount that is less than the amount
of such offer to settle. Notwithstanding the foregoing, the terms and provisions
of this Section 13.6 shall not  preclude  any party  hereto from  seeking,  or a
court of competent  jurisdiction from granting,  a temporary  restraining order,
temporary  injunction  or  other  equitable  relief  for any  breach  of (i) any
non-competition  or  confidentiality  covenant  or (ii)  any  duty,  obligation,
covenant,  representation or warranty, the breach of which may cause irreparable
harm or damage.

            (b) Arbitrators. In the event there is a claim, controversy, dispute
or  disagreement  among the  parties  hereto  arising out of or relating to this
Agreement (including any claim based on or arising from an alleged tort) and the
parties  hereto  have  not  reached   agreement   regarding  an  alternative  to
arbitration,  the parties agree to select within 30 days of notice by a party to
the  other  of its  desire  to seek  arbitration  under  this  Section  13.6 one
arbitrator mutually acceptable to Tatonka and the Sellers to hear and decide all
such claims under this Section 13.6. Each of the  arbitrators  proposed shall be
impartial and  independent  of all parties.  If the parties  cannot agree on the
selection  of an  arbitrator  within said 30-day  period,  then any party may in
writing  request the judge of the United States  District Court for the Northern
District  of Texas  senior in term of  service to appoint  the  arbitrator  and,
subject to this Section 13.6, such arbitrator shall hear all arbitration matters
arising under this Section 13.6.

            (c) Applicable Rules.

            (1) Each  arbitration  hearing  shall be held at a place in  Dallas,
     Texas acceptable to the arbitrator.  The arbitration  shall be conducted in
     accordance   with  the  Commercial   Arbitration   Rules  of  the  American
     Arbitration  Association  to the extent such rules do not conflict with the
     terms hereof;  provided,  however,  that if the parties  hereto agree to an
     alternative to arbitration  they may agree to an alternative  set of rules,
     including  as to rules of  evidence  and  procedure.  The  decision  of the
     arbitrator  shall be reduced to writing and shall be binding on the parties
     and such  decision  shall  contain a concise  statement  of the  reasons in
     support  of such  decision.  Judgment  upon the  award(s)  rendered  by the
     arbitrator  may be  entered  and  execution  had in any court of  competent
     jurisdiction  or  application  may be  made to such  court  for a  judicial
     acceptance  of the  award  and an order of  enforcement.  The  charges  and
     expenses of the  arbitrator  shall be shared  equally by the parties to the
     hearing.

            (2) The  arbitration  shall  commence  within  ten  days  after  the
     arbitrator  is selected in accordance  with the  provisions of this Section
     13.6. In fulfilling  his duties with respect to  determining  the amount of
     any loss,  the  arbitrator  may consider such matters as, in the opinion of
     the arbitrator,  are necessary or helpful to make a proper  valuation.  The
     arbitrator  may  consult  with and engage  disinterested  third  parties to
     advise the arbitrator.

                                       47

<PAGE>



     The arbitrator shall not add any interest factor  reflecting the time value
     of money  to the  amount  of any loss and  shall  not  award  any  punitive
     damages.

            (3) If the arbitrator  selected  hereunder  should die, resign or be
     unable to perform his or her duties hereunder,  the parties, or such senior
     judge (or such judge's  successor)  in the event the parties  cannot agree,
     shall select a  replacement  arbitrator.  The  procedure  set forth in this
     Section 13.6 for  selecting the  arbitrator  shall be followed from time to
     time as necessary.

            (4) As to any  determination of the amount of any loss, or as to the
     resolution of any other claim, controversy,  dispute or disagreement,  that
     under the terms hereof is made subject to arbitration,  no lawsuit based on
     such claimed loss or such  resolution  shall be  instituted  by the parties
     hereto,  other than to compel arbitration  proceedings or enforce the award
     of the arbitrator, except as otherwise provided in Section 11.7(b).

            (5)  All   privileges   under  Texas  and  Federal  law,   including
     attorney-client  and  work-  product  privileges,  shall be  preserved  and
     protected to the same extent that such  privileges  would be protected in a
     Federal court proceeding applying Texas law.

                                   ARTICLE XIV
                                   TERMINATION

     Section 14.1. Termination.  This Agreement may be terminated and the Merger
and the Acquisitions may be abandoned:

            (a) at any  time prior to  the Effective Time by mutual agreement of
all parties;

            (b) at any  time  prior  to the  Effective  Time by  Tatonka  if any
material  representation or warranty of the Company or any Stockholder contained
in this Agreement or in any certificate or other document executed and delivered
by the  Company or any  Stockholder  pursuant  to this  Agreement  is or becomes
untrue or breached in any material  respect or if the Company or any Stockholder
fails to comply in any material respect with any material  covenant or agreement
contained in this Agreement,  and any such  misrepresentation,  noncompliance or
breach is not  cured,  waived or  eliminated  within 30 days  after  receipt  of
written notice thereof;

            (c) at any time prior to the  Effective  Time by the  Company if any
representation or warranty of Tatonka or Tatonka Sub contained in this Agreement
or in any  certificate  or other  document  executed and delivered by Tatonka or
Tatonka Sub  pursuant to this  Agreement  is or becomes  untrue in any  material
respect of if Tatonka fails to comply in any material  respect with any covenant
or  agreement  contained  in this  Agreement,  and any  such  misrepresentation,
noncompliance or breach is not cured,  waived or eliminated within 30 days after
receipt of written notice thereof;

            (d) at any time  prior to the  Effective  Time by  Tatonka  if, as a
result of the conduct of due diligence  and  regulatory  compliance  procedures,
Tatonka deems termination to be advisable; or

                                       48

<PAGE>



            (e) by  Tatonka or the  Company  if the  Merger  shall not have been
consummated by March 31, 1998.

     Section 14.2.  Effect of Termination.  Except as set forth in Section 15.3,
in the event this  Agreement is  terminated  pursuant to this Article XIV,  this
Agreement shall forthwith become void.

                                   ARTICLE XV
                    NONDISCLOSURE OF CONFIDENTIAL INFORMATION

     Section  15.1.   Non-Disclosure   Covenant.   The  Company  recognizes  and
acknowledges  that each has in the past,  currently  has,  and in the future may
possibly  have,  access to certain  Confidential  Information of Tatonka and the
Surviving  Corporation  that is  valuable,  special  and a unique  asset of such
entity's  business.  Tatonka and Tatonka Sub acknowledges  that they have had in
the past, currently have, and in the future may possibly have, access to certain
Confidential  Information of the Company that is valuable,  special and a unique
asset of each such business.  The Company,  Tatonka and Tatonka Sub,  severally,
agree that they will not disclose such  Confidential  Information to any person,
firm,  corporation,  association  or other  entity  for any  purpose  or  reason
whatsoever,  except (a) to authorized  representatives of Tatonka,  Tatonka Sub,
Surviving  Corporation  and the Company and (b) to counsel and other advisers to
Tatonka,  Tatonka Sub, Surviving  Corporation and the Company provided that such
advisers  (other than counsel) agree to the  confidentiality  provisions of this
Section 15.1,  unless (i) such information  becomes available to or known by the
public generally through no fault of the Company, Tatonka or Tatonka Sub, as the
case may be, (ii) disclosure is required by law or the order of any governmental
authority under color of law, provided, that prior to disclosing any information
pursuant to this clause (ii) the  Company,  Tatonka or Tatonka  Sub, as the case
may be, shall,  if possible,  give prior written  notice thereof to the Company,
Tatonka or Tatonka Sub and provide the Company,  Tatonka or Tatonka Sub with the
opportunity to contest such  disclosure,  (iii) the disclosing  party reasonably
believes that such  disclosure  is required in connection  with the defense of a
lawsuit against the disclosing  party, or (iv) the disclosing  party is the sole
and exclusive owner of such  Confidential  Information as a result of the Merger
or otherwise.  In the event of a breach or threatened breach by the Company,  on
the one hand,  and Tatonka or Tatonka Sub, on the other hand, of the  provisions
of this Section, Tatonka, Tatonka Sub, the Surviving Corporation and the Company
shall be entitled to an injunction  restraining the other party, as the case may
be, from disclosing, in whole or in part, such Confidential Information. Nothing
in this  Agreement  shall be construed as  prohibiting  any of such parties from
pursuing  any other  available  remedy  for such  breach or  threatened  breach,
including the recovery of damages.

     Section 15.2.  Damages.  Because of the  difficulty  of measuring  economic
losses as a result of the breach of the foregoing covenants,  and because of the
immediate and irreparable  damage that would be caused for which they would have
no other adequate remedy,  Tatonka,  Tatonka Sub, the Surviving  Corporation and
the  Company  agree  that,  in the  event of a breach  by  either of them of the
foregoing covenant, the covenant may be

                                       49

<PAGE>



enforced against them by injunctions and restraining orders.

     Section 15.3.  Survival.  The obligations of the parties under this Article
XV shall survive the termination of this Agreement.

                                   ARTICLE XVI
                                  MISCELLANEOUS

     Section 16.1. Amendment;  Waivers. This Agreement may be amended,  modified
or  supplemented  only by an instrument  in writing  executed by all the parties
hereto.  Any waiver of any terms and conditions  hereof must be in writing,  and
signed by the parties  hereto.  The waiver of any of the terms and conditions of
this  Agreement  shall  not be  construed  as a waiver  of any  other  terms and
conditions hereof.

     Section  16.2.  Assignment.  Neither this  Agreement  nor any right created
hereby or in any  agreement  entered into in  connection  with the  transactions
contemplated  hereby shall be assignable by any party hereto,  except by Tatonka
to a wholly owned subsidiary of Tatonka; provided that any such assignment shall
not relieve Tatonka of its obligations hereunder.

     Section 16.3. Parties in Interest; No Third Party Beneficiaries.  Except as
otherwise provided in this Agreement, the terms and conditions of this Agreement
shall inure to the benefit of and be binding upon the  respective  heirs,  legal
representatives,  successors  and  assigns of the  parties  hereto.  Tatonka and
Tatonka Sub  acknowledge  and agree that the rights and  remedies of the Company
under this Agreement  will be directly  available to the  Stockholders  as third
party  beneficiaries  of the  rights  and  remedies  of the  Company  under this
Agreement,  including, without limitation, the rights and remedies under Article
XIII to indemnification from Tatonka and Tatonka Sub against Damages incurred by
the  Stockholders  resulting  from a breach by  Tatonka  or  Tatonka  Sub of any
representation, warranty or covenant of Tatonka or Tatonka Sub contained in this
Agreement. Except as provided in the preceding sentence or as otherwise provided
in this Agreement,  neither this Agreement nor any other agreement  contemplated
hereby  shall be deemed to confer upon any person not a party  hereto or thereto
any rights or remedies hereunder or thereunder.

     Section  16.4.  Entire   Agreement.   This  Agreement  and  the  agreements
contemplated hereby constitute the entire agreement of the parties regarding the
subject matter hereof,  and supersede all prior  agreements and  understandings,
both written and oral,  among the parties,  or any of them,  with respect to the
subject matter hereof.

     Section 16.5.  Severability.  If any provision of this Agreement is held to
be illegal,  invalid or  unenforceable  under  present or future laws  effective
during  the term  hereof,  such  provision  shall be  fully  severable  and this
Agreement  shall be  construed  and  enforced  as if such  illegal,  invalid  or
unenforceable  provision  never  comprised  a part  hereof;  and  the  remaining
provisions  hereof  shall  remain  in full  force  and  effect  and shall not be
affected by the illegal,  invalid or unenforceable provision or by its severance
therefrom.  Furthermore,  in lieu  of such  illegal,  invalid  or  unenforceable
provision,  there  shall  be added  automatically  as part of this  Agreement  a
provision as similar in its terms to such illegal, invalid or

                                       50

<PAGE>



unenforceable provision as may be possible and be legal, valid and enforceable.

     Section 16.6.  Survival of Representations,  Warranties and Covenants.  The
representations,  warranties  and covenants  contained in this  Agreement  shall
survive the Closing and all statements contained in any certificate,  exhibit or
other  instrument  delivered  by or on behalf of the Company,  any  Stockholder,
Tatonka or Tatonka Sub pursuant to this  Agreement  shall be deemed to have been
representations  and warranties by the Company,  such  Stockholder,  Tatonka and
Tatonka Sub.  Notwithstanding  any provision in this  Agreement to the contrary,
the representations and warranties contained in this Agreement shall survive the
Closing  until the second  anniversary  of the Closing  Date except that (a) the
representations  and  warranties  set  forth in  Section  3.20 with  respect  to
environmental  matters  shall  survive  for a  period  of  ten  years,  (b)  the
representations  and  warranties  set forth in Section  3.28 with respect to tax
matters shall survive until such time as the limitations  period has run for all
tax  periods  ended  prior to the  Closing  Date,  (c) the  representations  and
warranties contained in Section 3.25 and Section 3.31 with respect to healthcare
matters  shall  survive for a period of six years and (d) solely for purposes of
Section 13.1(c) and Section 13.2(c),  and solely to the extent that any party to
be indemnified  pursuant to such provisions  actually incurs liability under the
Securities  Act, the Exchange Act or any other Federal or state  securities law,
the  representations  and  warranties  set forth therein shall survive until the
expiration of any applicable limitations period.

     Section 16.7.  Governing Law. THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS
OF THE  PARTIES  HERETO  SHALL BE  GOVERNED  BY AND  CONSTRUED  AND  ENFORCED IN
ACCORDANCE WITH THE SUBSTANTIVE  LAWS (BUT NOT THE RULES GOVERNING  CONFLICTS OF
LAWS) OF THE STATE OF OKLAHOMA.

     Section 16.8. Captions.  The captions in this Agreement are for convenience
of reference  only and shall not limit or  otherwise  affect any of the terms or
provisions hereof.

     Section 16.9. Gender and Number.  When the context requires,  the gender of
all words used in this  Agreement  shall  include the  masculine,  feminine  and
neuter and the number of all words shall include the singular and plural.

     Section 16.10. Confidentiality; Publicity and Disclosures. Each party shall
keep this Agreement and its terms confidential,  and shall make no press release
or  public  disclosure,  either  written  or oral,  regarding  the  transactions
contemplated  by this Agreement  without the prior  knowledge and consent of the
other  parties  hereto;  provided  that the  foregoing  shall not  prohibit  any
disclosure (a) by press release, filing or otherwise that Tatonka has determined
in its good faith  judgment and after advice of legal  counsel to be required by
Federal  securities laws or the rules of the National  Association of Securities
Dealers,  (b) to attorneys,  accountants,  investment bankers or other agents of
the  parties   assisting  the  parties  in  connection  with  the   transactions
contemplated  by this Agreement and (c) by Tatonka in connection with conducting
an examination  of the  operations  and assets of the  Companies;  provided that
Tatonka shall reasonably  promptly  provide notice of any release.  In the event
that the  transactions  contemplated  hereby are not  consummated for any reason
whatsoever,

                                       51

<PAGE>



the parties  hereto  agree not to disclose or use any  Confidential  Information
they  may  have  concerning  the  affairs  of  the  other  parties,  except  for
information  that is required by law to be  disclosed;  provided that should the
transactions  contemplated hereby not be consummated,  nothing contained in this
Section  shall be  construed  to  prohibit  the parties  hereto  from  operating
businesses in competition with each other.

     Section  16.11.  Notice.  Whenever this  Agreement  requires or permits any
notice,  request,  or demand from one party to another,  the notice,  request or
demand must be in writing to be  effective  and shall be deemed to be  delivered
and received (i) if personally  delivered or if delivered by telex,  telegram or
courier  service,  when  delivered to the party to whom notice is sent,  (ii) if
delivered by facsimile  transmission,  when so sent and receipt  acknowledged by
receipt or (iii) if delivered by mail (whether actually received or not), at the
close of business on the third  business day next  following the day when placed
in  the  mail,  postage  prepaid,  certified  or  registered,  addressed  to the
appropriate  party or parties,  at the address of such party set forth below (or
at such other address as such party may designate by written notice to all other
parties in accordance herewith):

         If to Tatonka or Tatonka Sub:

         Tatonka Energy, Inc.
         1601 N.W. Expressway, Suite 1910
         Oklahoma City, Oklahoma 73118
         Attn. Mr. Joe R. Love

         with a copy to:

         Derrick & Briggs
         Bank One Center, 20th Floor
         100 N. Broadway Ave.
         Oklahoma City, Oklahoma  73102
         Attn. Mr. Gary W. Derrick

         If to the Company or any Stockholder:

         Phy. Med., Inc.
         9603 White Rock Trail, Suite 100
         Dallas, Texas  75258
         Attn. Mr. George C. Barker

         with a copy to:

         Bruce B. Hart, Esq.
         Bruce B. Hart, P.C.
         10440 North Central Expressway
         Suite 610
         Dallas Texas 75231

                  AND

                                       52

<PAGE>



         James V. Grevelle, Esq.
         James V. Grevelle, P.C.
         15303 Dallas Parkway, Suite 700, LB 17 Dallas, Texas 75248

     Section  16.12.  No  Waiver;  Remedies.  No party  hereto  shall by any act
(except  by  written  instrument  pursuant  to  Section  16.1  hereof),   delay,
indulgence,  omission or  otherwise be deemed to have waived any right or remedy
hereunder or to have  acquiesced in any default in or breach of any of the terms
and conditions hereof. No failure to exercise,  nor any delay in exercising,  on
the part of any party  hereto,  any right,  power or privilege  hereunder  shall
operate as a waiver thereof.  No single or partial exercise of any right,  power
or privilege  hereunder shall preclude any other or further  exercise thereof or
the exercise of any other right, power or privilege. No remedy set forth in this
Agreement  or  otherwise  conferred  upon or  reserved  to any  party  shall  be
considered  exclusive of any other remedy  available to any party,  but the same
shall be distinct,  separate and  cumulative  and may be exercised  from time to
time as often as occasion may arise or as may be deemed expedient.

     Section  16.13.  Counterparts.  This  Agreement may be executed in multiple
counterparts,  each of  which  shall be  deemed  an  original,  and all of which
together shall constitute one and the same instrument.

     Section 16.14.  Defined Terms. Terms used in the Exhibits to this Agreement
and the  Disclosure  Schedules  with their initial  letter  capitalized  and not
otherwise  defined  therein shall have the meanings as assigned to such terms in
this Agreement.













                                       53

<PAGE>



     IN WITNESS WHEREOF, the parties have duly executed this Agreement as of the
date first written above.


TATONKA:                  TATONKA ENERGY, INC.



                          By:  /s/ Joe Foor
                               ------------------------------
                               Joe Foor
                               President


TATONKA SUB:              TATONKA ENERGY SUBSIDIARY, INC.,



                          By: /s/ Joe Foor
                              -------------------------------
                              Joe Foor
                              President


THE COMPANY:              PHY. MED., INC.



                          By: /s/ George C. Barker
                              -------------------------------
                              George C. Barker
                              President
BARKER:



                              /s/ George C. Barker
                              -------------------------------
                              George C. Barker


ESOP:                     EMPLOYEE STOCK OWNERSHIP
                          PLAN OF PHY. MED, INC.



                          By:  /s/ George C. Barker
                               ------------------------------
                               George C. Barker, Trustee


                                       54

<PAGE>



                        Exhibit A - Merger Consideration


The  Stockholders  shall  receive the  following  Tatonka  Common Stock as their
Merger Consideration:

George C. Barker...............................................54,230,788 shares

The ESOP.......................................................15,184,621 shares

Total Merger Consideration.....................................69,415,409 shares



                                       55

<PAGE>

                                             
<TABLE>

<CAPTION>
                      Exhibit "B" - Preferred Stock Listing

                                                                                     CANCELLED/
                                        CERTIFICATE         PREFERRED      DATE      CONVERTED      COMMON      REMAINING
SHAREHOLDER                            CO.        NO.         SHARES    CONVERTED      SHARES       SHARES      PREFERRED
- -----------                            ---    ---------     ---------   ---------    ----------     -------     ---------
<S>                                                                        <C>        <C>          <C>            <C>    
                                                                                                                  
Adams, Gaylon                          SEC    P-2-   1        4,098                                               4,098
Adams, John                            SEC    P-2-   2        2,089                                               2,089
B-SH Enterprises                       SEC    P-2-   11       3,688                                               3,688
Beals, James A. & Teri                 SEC    P-2-   5        2,048                                               2,048
Bernstein, Barbara L.                  SEC    P-2-   34       4,098                                               4,098
Bird Investment                        SEC    P-2-   6        2,048                                               2,048
Blanton, Mary C.                       SEC    P-2-   8        2,048         4/95      (2,048)                         0
Blanton, Mary C. 1991 Revocable        TEI    P-     12       2,048                                               2,048
         Trust U/A Dtd.
Boatman, Dr. Karl K.                   SEC    P-2-   7        4,098                                               4,098
Bowman, Roger B.                       SEC    P-2-   9        2,048         1/95      (2,048)                         0
Bowman, Roger B. Revocable             TEI    P-     1        2,048                                               2,048
         Living Trust
Brelsford, C.D. & Barbara              SEC    P-2-   10       2,048         1/95      (2,048)                         0
Buchanan, James C. III                 SEC    P-2-   12       2,048                                               2,048
Buchholz, Don                          SEC    P-2-   13       2,048                                               2,048
Cobb, Allen B.                         SEC    P-2-   14       2,048         1/95      (2,048)                         0
Cobb, Allen B.                         TEI    P-     2        2,048                                               2,048
Croley, Marion, D.D.S.                 SEC    P-2-   15       2,048         1/95      (2,048)                         0
Davis, William A.                      SEC    P-2-   16       4,098                                               4,098
Diamond H. Partnership                 SEC    P-2-   18       8,195                                               8,195
Evans, Mary J.                         SEC    P-2-   19       2,459         3/95      (2,459)                         0
Evans, Mary J.                         TEI    P-     9        2,459                                               2,459
Foor, Joe Paul                         SEC    P-2    4        8,112         3/95      (8,112)      27,413             0
Foor, Anne C.                          TEI    P-     11       4,000                                               4,000
Foor, Joe Paul                         TEI    P-     10       4,112         4/95      (4,112)      27,413             0
Garland, Bud F., Trustee               SEC    P-2-   20       2,048         9/93      (2,048)      13,653             0
Garland, Gary F.                       SEC    P-2-   21       2,048                                               2,048
Graves, Ron L.                         SEC    P-2-   22       2,048         4/95      (2,048)                         0
Graves, Ron L.                         TEI    P-     13       2,048                                               2,048
HiPoint Petroleum                      SEC    P-2-   23      12,290                                              12,290
Holt, A.B.                             SEC    P-2-   24       2,048                                               2,048


                                       56
<PAGE>


Hutchison, Harold D.                   SEC    P-2-   25       2,048         3/95      (2,048)                         0
Hutchison, Harold D.                   TEI    P-     8        2,048                                               2,048
James, Mel                             SEC    P-2-   3        2,089                   (2,089)                         0
Johnston, John W.                      SEC    P-2-   26       4,098                                               4,098
Kemper Clearing Corp.                  TEI    P-     7        2,048         4/96      (2,048)                         0
EVEREN Clearing Corp.                  TEI    P-     14       2,048                                               2,048
Kendrick, Carl B.                      SEC    P-2-   27       2,048                   (2,048)                         0
McGarrahan, Dedmon II                  SEC    P-2-   17       2,048                                               2,048
Mitchell, Robert H.                    SEC    P-2-   27       2,048                                               2,048
Partridge Capital Corporation          SEC    P-2-   29      10,242                                              10,242
Payne, Vivian S.                       SEC    P-2-   30       2,048         1/95      (2,048)                         0
Payne, Vivian S.                       TEI    P-     3        2,048                                               2,048
Prudential Securities Incorporated     TEI    P-     4        2,048                                               2,048
R & M Investments                      SEC    P-2-   31       2,048                                               2,048
Ritchey, J. Rickey & Jack Reynolds,    SEC    P-2-   32       2,048                                               2,048
Rosenthal, Dr. Avram E.                SEC    P-2-   33       4,098         1/95      (4,098)                         0
Rosenthal, Dr. Avram E.                TEI    P-     5        4,098                                               4,098
Scholl, Richard L.                     SEC    P-2-   35       2,048                   (2,048)                         0
Seikel   Energy Partnership            SEC    P-2-   36      12,290                                              12,290
Spivey, Dan, M.D.                      SEC    P-2-   37       2,048                                               2,048
Temple & Temple                        SEC    P-2-   38       2,048                                               2,048
Thompson, James L. & Steve             SEC    P-2-   39       6,146                                               6,146
         Horowitz
Triplett-Organ                         SEC    P-2-   40       2,048         1/95      (2,048)                         0
Triplett-Organ                         TEI    P-     6        2,048                                               2,048
Upp, Brian H.                          SEC    P-2-   41       2,048                                               2,048
Vucicevic, Dusan, M.D.                 SEC    P-2-   43       2,048                                               2,048
Wood, C. Courtney                      SEC    P-2-   42       2,048                                               2,048
                                                            -------             ---------------------------------------
                                                            182,633                   (47,494)    68,479        135,139
                                                            =======             =======================================
</TABLE>

  


                                     57


<PAGE>

                  Exhibit C - Stockholder Representation Letter







To the Board of Directors of Tatonka:

     As a Stockholder  and party to the Merger  Agreement of even date herewith,
and in  consideration  of the shares of Tatonka Common Stock that I will receive
if the Merger is closed, I hereby represent to you as follows:

     (a) I am  acquiring  the  Tatonka  Common  Stock  for  my own  account  for
         investment  and not with a view to, or for resale in  connection  with,
         any  distribution  or the  grant of any  participation  in the  Tatonka
         Common Stock,  and I have has no present  intention of distributing any
         Tatonka  Common Stock.  I am an  "accredited  investor" as that term is
         defined in Regulation D under the Securities Act of 1993 (the "Act"). I
         understand that the shares of Tatonka Common Stock that I am to receive
         as the Merger  Consideration are "restricted  securities" under the Act
         and can only be sold under Rule 144 as promulgated under the Act.

     (b) I represent  and warrant that I am qualified  by my own  experience  in
         financial  and  business  matters to evaluate  the Merger and that I am
         able to bear any economic  loss  resulting  from the Merger and to hold
         such Tatonka Common Stock indefinitely. I understand that no Federal or
         state  governmental  authority  has made any  finding or  determination
         relating the fairness of the Merger.  I represent  and warrant that the
         Merger is suitable for me in light of the circumstances.

     (c) I am familiar with the business,  operations and financial condition of
         Phy.Med.,  Inc. and have had full and  complete  access to all material
         information about Tatonka and such other information I deem material to
         the business of Tatonka and Phy.Med.  Inc., and to the  consummation of
         the Merger, and I am relying upon no oral representations in connection
         with the Merger.

         These  representations  and warranties are made as of the Closing Date.
Capitalized  terms  used  herein  shall  have the  meaning  given in the  Merger
Agreement.

                                                     Sincerely,


                                                     /s/ George C. Barker
                                                     --------------------
                                                     George C. Barker

                                        1

<PAGE>








To the Board of Directors of Tatonka:

     As a Stockholder  and party to the Merger  Agreement of even date herewith,
and in  consideration of the shares of Tatonka Common Stock that it will receive
if the Merger is closed,  the Employee Stock  Ownership Plan of Phy. Med.,  Inc.
(the "ESOP") hereby represents to you as follows:

     (a) The ESOP is acquiring the Tatonka  Common Stock for its own account for
         investment  and not with a view to, or for resale in  connection  with,
         any  distribution  or the  grant of any  participation  in the  Tatonka
         Common  Stock,  and it has no present  intention  of  distributing  any
         Tatonka  Common  Stock.  It is  "accredited  investor"  as that term is
         defined in Regulation D under the  Securities  Act of 1993 (the "Act").
         The ESOP understands that the shares of Tatonka Common Stock that it is
         to receive  as the Merger  Consideration  are  "restricted  securities"
         under the Act and can only be sold under Rule 144 as promulgated  under
         the Act.

     (b) The Trustee of the ESOP represents and warrants that he is qualified by
         his own  experience in financial  and business  matters to evaluate the
         Merger and that the Merger and the  investment  in the  Tatonka  Common
         Stock is a suitable  investment  for the ESOP. The ESOP is able to bear
         any economic  loss  resulting  from the Merger and to hold such Tatonka
         Common Stock  indefinitely.  The ESOP  acknowledges  that no Federal or
         state  governmental  authority  has made any  finding or  determination
         relating the fairness of the Merger.

     (c) The ESOP has had full and complete  access to all material  information
         about Tatonka and such other  information its Trustee deems material to
         the business of Tatonka and Phy.Med.  Inc., and to the  consummation of
         the  Merger.  The  ESOP is  relying  upon no  oral  representations  in
         connection with the Merger.

         These  representations  and warranties are made as of the Closing Date.
Capitalized  terms  used  herein  shall  have the  meaning  given in the  Merger
Agreement.

                               Sincerely,
                               Employee Stock Ownership Plan of Phy. Med., Inc.


                               By:  /s/ George C. Barker, Trustee
                                    -----------------------------
                                    George C. Barker, Trustee


                                        2




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