UNION TEXAS PETROLEUM HOLDINGS INC
8-K, 1998-04-02
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
 
================================================================================
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
 
                             ---------------------
 
                                    FORM 8-K
 
                                 CURRENT REPORT
                       PURSUANT TO SECTION 13 OR 15(d) OF
                      THE SECURITIES EXCHANGE ACT OF 1934
 
                             ---------------------
 
        Date of Report (Date of earliest event reported): APRIL 1, 1998
 
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
             (Exact name of Registrant as specified in its charter)
 
<TABLE>
<S>                     <C>           <C>
       DELAWARE            1-9019         76-0040040
   (State or other      (Commission    (I.R.S. Employer
   jurisdiction of      File Number)  Identification No.)
    incorporation)
</TABLE>
 
                 1330 POST OAK BOULEVARD, HOUSTON, TEXAS 77056
              (Address of principal executive offices) (Zip Code)
 
       Registrant's telephone number, including area code (713) 623-6544
 
================================================================================
<PAGE>   2
 
ITEM 5. OTHER EVENTS.
 
     On this Current Report on Form 8-K, the Registrant is filing with the
Securities and Exchange Commission certain items that are to be incorporated by
reference into its Registration Statement on Form S-3 (Registration No.
333-31039).
 
     Preferred Stock Offering. On March 6, 1998, the Registrant issued 1,750,000
shares of 7.14% Series A Cumulative Preferred Stock ($.01 par value per share,
liquidation preference $100 per share)(the "Preferred Stock") under a shelf
registration of up to $500 million aggregate amount of securities of the
Registrant. Net proceeds from the sale of the Preferred Stock in the amount of
approximately $171.3 million were used to reduce a portion of the Registrant's
debt under its $450 million revolving credit agreement and its uncommitted and
unsecured lines of credit incurred primarily in connection with the Registrant's
acquisition of interests in operating service contracts in Venezuela. In
addition, the Registrant declared a dividend to all holders of the Preferred
Stock of record on March 15, 1998, which was paid on March 31, 1998.
 
     Financing Activities. On March 9, 1998, the Registrant terminated its $100
million revolving credit facility with NationsBank of Texas, N.A., as agent,
Bank of America National Trust and Savings Association and Union Bank of
Switzerland, Houston Agency, as co-agents, and replaced it on March 10, 1998,
with a new $100 million revolving credit agreement on the same terms that
provides for conversion of amounts outstanding on March 8, 1999 to a one-year
term loan maturing March 8, 2000.
 
     Appointments. Union Texas Americas Limited, an indirect subsidiary of the
Registrant, appointed Carlos del Solar, as President and General Manager of
Union Texas Venezuela Limited, and Charlie Latch, as Executive Vice President of
Operations for Union Texas Venezuela Limited. Together, Mr. del Solar and Mr.
Latch will direct the Registrant's growing activities in Venezuela from its new
Venezuelan headquarters in Caracas. Union Texas Petroleum Limited, a
London-based subsidiary of the Registrant, appointed Roger P. Coe as Managing
Director. Mr. Coe succeeds John E. Kennedy, who was recently named President of
Union Texas Central Asia Limited, based in Kazakhstan. Mr. Kennedy is replacing
John W. J. Hardy, who recently announced his retirement plans.
 
     Recent Developments. In March 1998, oil prices fell to their lowest levels
since 1988. For example, the spot price for West Texas Intermediate averaged
approximately $15.92 for the first quarter of 1998 down from approximately
$22.74 for the first quarter of 1997. As compared to the first quarter of 1997,
which was favorably impacted by higher oil prices with net income of $64 million
or $.74 per share, lower oil prices in 1998 will result in the Company recording
significantly lower earnings in the first quarter of 1998. In light of the
current low oil price environment, the Company is reviewing its capital
expenditure budget for 1998 and expects that any reductions in capital and
operating expenses would not significantly impact current operations but defer
certain exploration and development plans. Any such deferrals could limit
opportunities for new reserves from exploration successes and delay anticipated
production from certain properties thus impacting future net income and cash
flows.
 
     This Current Report contains forward-looking statements within the meaning
of and in reliance upon the "safe harbor" provisions of the Private Securities
Litigation Reform Act, as set forth in Section 27A of the Securities Act of
1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as
amended, that involve risks and uncertainties, including price volatility (as
evidenced by the recent decline in market prices for crude oil), development,
operational, marketing and opportunity risks, and other factors described from
time to time in the registrant's publicly available SEC reports, which could
cause actual results to differ materially.
<PAGE>   3
 
ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS.
 
     (c) Exhibits:
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
           1.1           -- Underwriting Agreement between the Company and the
                            Underwriters with respect to the MAPS(SM) (the "MAPS")
           4.13          -- Form of      % Mandatory Putable/remarketable Securities
                            (MAPS(SM)) due April   , 2038
           5.1           -- Opinion of King & Spalding regarding legality of the MAPS
          12.1           -- Computation of Ratio of Earnings to Fixed Charges;
                            Computation of Ratio of Earnings to Combined Fixed
                            Charges and Preferred Stock Dividends
          23.2           -- Consent of legal counsel included in Exhibit 5.1
</TABLE>
<PAGE>   4
 
                                   SIGNATURE
 
     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.
 
                                            UNION TEXAS PETROLEUM HOLDINGS, INC.
 
                                            By:    /s/ LARRY D. KALMBACH
 
                                              ----------------------------------
                                              Larry D. Kalmbach
                                              Vice President and Chief Financial
                                                Officer
 
Date: April 1, 1998
<PAGE>   5
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
           1.1           -- Underwriting Agreement between the Company and the
                            Underwriters with respect to the MAPS(SM) (the "MAPS")
           4.13          -- Form of      % Mandatory Putable/remarketable Securities
                            (MAPS(SM)) due April   , 2038
           5.1           -- Opinion of King & Spalding regarding legality of the MAPS
          12.1           -- Computation of Ratio of Earnings to Combined Fixed
                            Charges; Computation of Ratio of Earnings to Combined
                            Fixed Charges and Preferred Stock Dividends
          23.2           -- Consent of legal counsel included in Exhibit 5.1
</TABLE>

<PAGE>   1
 
                                                                     EXHIBIT 1.1
 
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
                            (A DELAWARE CORPORATION)
 
                % MANDATORY PUTABLE/REMARKETABLE SECURITIES DUE 2038
 
                             UNDERWRITING AGREEMENT
 
                                                                  April   , 1998
 
SALOMON BROTHERS INC
Chase Securities Inc.
NationsBanc Montgomery Securities LLC
c/o Salomon Brothers Inc
388 Greenwich Street
New York, New York 10013
 
Dear Sirs:
 
     Union Texas Petroleum Holdings, Inc., a Delaware corporation (the
"Company"), proposes, subject to the terms and conditions stated herein, to
issue and sell to Salomon Brothers Inc, Chase Securities Inc. and NationsBanc
Montgomery Securities LLC, Inc. (the "Underwriters") an aggregate of
$            principal amount of     % MAndatory Putable/remarketable Securities
due 2038 of the Company (the "MAPS(SM)" or the "Notes").
 
     1. The Company represents and warrants to, and agrees with, each of the
Underwriters that:
 
          (i) A registration statement in respect of the Notes has been filed
     with the Securities and Exchange Commission (the "Commission"); such
     registration statement and any post-effective amendment thereto, each in
     the form heretofore delivered to you, and, excluding exhibits thereto but
     including all documents incorporated by reference in the prospectus
     contained therein, have been declared effective by the Commission in such
     form; no other document with respect to such registration statement or
     document incorporated by reference therein has heretofore been filed with
     the Commission; and no stop order suspending the effectiveness of such
     registration statement has been issued and no proceeding for that purpose
     has been initiated or threatened by the Commission; the various parts of
     such registration statement, including all exhibits thereto (other than the
     Statement of Eligibility and Qualification on Form T-1 of the Trustee (as
     defined below)) and including the documents incorporated by reference in
     the prospectus contained in the registration statement at the time such
     part of the registration statement became effective, each as amended at the
     time such part of the registration statement became effective, being
     hereinafter called the "Registration Statement"; the final prospectus, as
     supplemented by any prospectus supplement (the "Prospectus Supplement"),
     used in connection with the offering of the Notes, in the final form filed
     with the Commission pursuant to Rule 424(b) under the Securities Act of
     1933, as amended (the "Act"), being hereinafter called the "Prospectus";
     any reference herein to the Prospectus being deemed to refer to and include
     the documents incorporated by reference therein pursuant to Item 12 of Form
     S-3 under the Act, as of the date of such Prospectus; any reference to any
     amendment or supplement to the Prospectus being deemed to refer to and
     include any documents filed after the date of such Prospectus under the
     Securities Exchange Act of 1934, as amended (the "Exchange Act"), and
     incorporated by reference in such Prospectus; and any reference to any
     amendment to the Registration Statement shall be deemed to refer to and
     include any annual report of the Company filed pursuant to Section 13(a) or
     15(d) of the Exchange Act after the effective date of the Registration
     Statement that is incorporated by reference in the Registration Statement;
 
          (ii) The documents incorporated by reference in the Prospectus or any
     amendment or supplement thereto, when they became effective or were filed
     with the Commission, as the case may be, conformed in all material respects
     to the requirements of the Act or the Exchange Act, as applicable, and the
     published
                                        1
<PAGE>   2
 
     rules and regulations of the Commission thereunder, and none of such
     documents contained an untrue statement of a material fact or omitted to
     state a material fact required to be stated therein or necessary to make
     the statements therein not misleading; and any further documents so filed
     and incorporated by reference in the Prospectus or any further amendment or
     supplement thereto, when such documents become effective or are filed with
     the Commission, as the case may be, will conform in all material respects
     to the requirements of the Act or the Exchange Act, as applicable, and the
     rules and regulations of the Commission thereunder, and will not contain an
     untrue statement of a material fact or omit to state a material fact
     required to be stated therein or necessary to make the statements therein
     not misleading;
 
          (iii) The Registration Statement and the Prospectus conforms, and any
     further amendment or supplement to the Registration Statement or the
     Prospectus will conform, in all material respects to the requirements of
     the Act and the published rules and regulations of the Commission
     thereunder and do not and will not, as of the applicable effective date as
     to the Registration Statement and any amendment thereto and as of the
     applicable filing date as to the Prospectus and any amendment or supplement
     thereto, contain an untrue statement of a material fact or omit to state a
     material fact required to be stated therein or necessary to make the
     statements therein not misleading; provided, however, that this
     representation and warranty shall not apply to any statements or omissions
     made in reliance upon and in conformity with information furnished in
     writing to the Company by you expressly for use therein;
 
          (iv) The Prospectus was filed with the Commission pursuant to Rule
     424(b)(5) within the applicable time period prescribed for such filing by
     the rules and regulations under the Act;
 
          (v) None of the Company or any of its subsidiaries or, to the best of
     the Company's knowledge, Unimar Company, a Texas general partnership
     ("Unimar"), has sustained since the date of the latest audited financial
     statements included or incorporated by reference in the Prospectus any loss
     or interference with its business from fire, explosion, flood or other
     calamity, whether or not covered by insurance, or from any labor dispute or
     court or governmental action, order or decree, otherwise than as set forth
     or contemplated in the Prospectus, which loss or interference is material
     to the Company and its subsidiaries taken as a whole; and, since the
     respective dates as of which information is given in the Registration
     Statement and the Prospectus, there has not been any change in the capital
     stock (other than (i) any shares of capital stock of the Company sold upon
     exercise of a subscription, option or warrant or the conversion of a
     security outstanding on the date of this Agreement or (ii) any shares of
     such capital stock, or other securities convertible or exercisable or
     exchangeable for such shares, in either case issued pursuant to any
     employee stock option, benefit or deferred compensation plan of the Company
     existing on the date of this Agreement) or any increase of more than
     $75,000,000 in the consolidated short-term or long-term debt of the Company
     or any material adverse change, or any development involving a prospective
     material adverse change, in or affecting the general affairs, management,
     financial position, stockholders' equity or results of operations of the
     Company and its subsidiaries taken as a whole, otherwise than as set forth
     or contemplated in the Registration Statement or the Prospectus;
 
          (vi) The Company has been duly incorporated and is validly existing as
     a corporation in good standing under the laws of the State of Delaware,
     with power and authority (corporate and other) to own its properties and
     conduct its business as described in the Prospectus, and has been duly
     qualified as a foreign corporation for the transaction of business and is
     in good standing under the laws of each other jurisdiction in which it owns
     or leases properties, or conducts any business, so as to require such
     qualification, or is subject to no material liability or disability by
     reason of the failure to be so qualified in any such jurisdiction; each
     subsidiary of the Company identified in Annex II hereto (collectively, the
     "Material Subsidiaries") has been duly incorporated and is validly existing
     as a corporation in good standing under the laws of its jurisdiction of
     incorporation; Unimar has been duly formed and is validly existing as a
     partnership under the laws of the State of Texas; and the Company does not
     have any subsidiary that is a "significant subsidiary" (within the meaning
     of the published rules and regulations of the Commission under the Act)
     that is not identified in Annex II hereto;
 
                                        2
<PAGE>   3
 
          (vii) All of the issued shares of capital stock of the Company have
     been duly and validly authorized and issued, are fully paid and
     non-assessable; and all of the issued shares of capital stock of each
     Material Subsidiary have been duly and validly authorized and issued and
     are fully paid and non-assessable, and all of such shares of capital stock
     and 50% of the equity interests in Unimar (except for directors' qualifying
     shares and shares held by third parties solely to satisfy local law
     requirements and except as set forth in the Prospectus) are owned directly
     or indirectly by the Company, free and clear of all liens, encumbrances,
     equities or claims;
 
          (viii) The Notes have been duly authorized by the Company and, when
     issued and delivered pursuant to this Agreement, will have been duly
     executed, authenticated, issued and delivered by the Company and will
     constitute valid and legally binding obligations of the Company entitled to
     the benefits provided by the indenture dated as of March 15, 1995, as
     supplemented by the supplemental indenture dated November 7, 1995 (the
     "Indenture"), among the Company, the subsidiaries of the Company named
     therein and The First National Bank of Chicago, as Trustee (the "Trustee"),
     under which they are to be issued, which was filed as an exhibit to the
     Registration Statement; the Indenture has been duly authorized by the
     Company and duly qualified under the Trust Indenture Act of 1939, as
     amended (the "Trust Indenture Act") and constitutes a valid and legally
     binding instrument of the Company, enforceable against the Company in
     accordance with its terms, subject, as to enforcement, to bankruptcy,
     insolvency, reorganization and other laws of general applicability relating
     to or affecting creditors' rights and to general equity principles; and the
     Notes will, and the Indenture does, conform to the descriptions thereof in
     the Prospectus;
 
          (ix) The issue and sale of the Notes and the compliance by the Company
     with all of the provisions of the Notes, the Indenture and this Agreement
     and the consummation of the transactions herein and therein contemplated
     will not conflict with or result in a breach or violation of any of the
     terms or provisions of, or constitute a default under, any indenture,
     mortgage, deed of trust, loan agreement or other agreement or instrument to
     which the Company or any of its subsidiaries or, to the best of the
     Company's knowledge, Unimar is a party or by which the Company or any of
     its subsidiaries or Unimar is bound or to which any of the property or
     assets of the Company or any of its subsidiaries or Unimar is subject, or
     any statute or any order, rule or regulation of any court or governmental
     agency or body having jurisdiction over the Company, any of its
     subsidiaries or Unimar or any of their properties (excluding conflicts,
     breaches, violations and defaults that, individually or in the aggregate,
     will not have any material adverse effect on the general affairs,
     management, financial position, stockholders' equity, results of operations
     or prospects of the Company and its subsidiaries taken as a whole), nor
     will any such action result in any violation of the provisions of the
     Restated Certificate of Incorporation or By-laws of the Company; and no
     consent, approval, authorization, order, registration or qualification of
     or with any such court or governmental agency or body is required for the
     consummation by the Company of the transactions contemplated by this
     Agreement or the Indenture, except the registration under the Act of the
     Notes, the qualification under the Trust Indenture Act of the Indenture and
     such consents, approvals, authorizations, registrations or qualifications
     as may be required under state securities or Blue Sky laws in connection
     with the purchase and distribution of the Notes by the Underwriters;
 
          (x) Other than as set forth in the Prospectus, there are no legal or
     governmental proceedings pending to which the Company or any of its
     subsidiaries or, to the best of the Company's knowledge, Unimar is a party
     or of which any property of the Company or any of its subsidiaries or, to
     the best of the Company's knowledge, Unimar is the subject which, if
     determined adversely to the Company or any of its subsidiaries or Unimar,
     would individually or in the aggregate have a material adverse effect on
     the consolidated financial position, stockholders' equity or results of
     operations of the Company and its subsidiaries taken as a whole; and, to
     the best of the Company's knowledge, no such proceedings are threatened or
     contemplated by governmental authorities or threatened by others;
 
          (xi) Price Waterhouse LLP, who have certified certain financial
     statements of the Company and its subsidiaries, are independent public
     accountants as required by the Act and the rules and regulations of the
     Commission thereunder;
 
                                        3
<PAGE>   4
 
          (xii) The Company is not an "investment company" within the meaning of
     the Investment Company Act of 1940, as amended (the "Investment Company
     Act"), and the published rules and regulations of the Commission
     thereunder, and the offer and sale of the Notes will not subject the
     Company to registration under, or result in a violation of, the Investment
     Company Act; and
 
          (xiii) Neither the Company nor any of its affiliates does business
     with the government of Cuba or with any person or affiliate located in Cuba
     within the meaning of Section 517.075, Florida Statutes.
 
     2. Subject to the terms and conditions herein set forth, the Company agrees
to issue and sell to each of the Underwriters, and each of the Underwriters
agrees, severally and not jointly, to purchase from the Company, at a purchase
price of     % of the principal amount thereof, plus accrued interest, if any,
from April   , 1998 to the Time of Delivery (as defined in Section 4 hereof),
the principal amount of the Notes set forth opposite the name of such
Underwriter on Schedule A hereto.
 
     3. Upon the authorization by you of the release of the Notes, the several
Underwriters propose to offer the Notes for sale upon the terms and conditions
set forth in the Prospectus.
 
     4. The Notes to be purchased by each Underwriter hereunder, in definitive
form and in such denominations and registered in such names as Salomon Brothers
Inc, on behalf of the Underwriters, may request upon at least forty-eight hours'
prior notice to the Company, shall be delivered by or on behalf of the Company
to you against payment by you by certified or official bank check or checks,
payable to the order of the Company, in immediately available funds, all at the
office of Salomon Brothers Inc, 388 Greenwich Street, New York, New York. The
time and date of such delivery and payment shall be 9:30 a.m., New York time, on
April   , 1998 or such other time and date as you and the Company may agree upon
in writing, such time and date being herein called the "Time of Delivery." Such
certificates will be made available for checking and packaging at least
twenty-four hours prior to the Time of Delivery at such office of Salomon
Brothers Inc.
 
     5. The Company agrees with each of the Underwriters:
 
          (a) To prepare the Prospectus Supplement in a form approved by you and
     to file the Prospectus Supplement pursuant to Rule 424(b) under the Act not
     later than the Commission's close of business on the second business day
     following the execution and delivery of this Agreement, or, if applicable,
     such earlier time as may be required by Rule 424(b) under the Act; to make
     no further amendment or supplement to the Registration Statement or
     Prospectus after the date of this Agreement and prior to the Time of
     Delivery which shall be reasonably disapproved by you promptly after
     reasonable notice thereof; to advise you, promptly after it receives notice
     thereof, of the time after the Time of Delivery when any supplement to the
     Prospectus or any amended Prospectus has been filed and to furnish you
     copies thereof; to file promptly all reports and any definitive proxy or
     information statements required to be filed by the Company with the
     Commission pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange
     Act subsequent to the date of the Prospectus and for so long as the
     delivery of a prospectus is required in connection with the offering or
     sale of the Notes; to advise you, promptly after it receives notice
     thereof, of the issuance by the Commission of any stop order or of any
     order preventing or suspending the use of any prospectus, of the suspension
     of the qualification of the Notes for offering or sale in any jurisdiction,
     of the initiation or threatening of any proceeding for any such purpose, or
     of any request by the Commission for the amending or supplementing of the
     Registration Statement or Prospectus or for additional information; and, in
     the event of the issuance of any stop order or of any order preventing or
     suspending the use of any prospectus or suspending any such qualification,
     to use promptly its best efforts to obtain its withdrawal;
 
          (b) Promptly from time to time to take such action as you may
     reasonably request to qualify the Notes for offering and sale under the
     securities laws of such jurisdictions as you may request and to comply with
     such laws so as to permit the continuance of sales and dealings therein in
     such jurisdictions for as long as may be necessary to complete the
     distribution of the Notes, provided that in connection therewith the
     Company shall not be required to qualify as a foreign corporation or to
     file a general consent to service of process in any jurisdiction;
 
                                        4
<PAGE>   5
 
          (c) To furnish you with copies of the Prospectus in such quantities as
     you may from time to time reasonably request, and, if the delivery of a
     prospectus is required in the judgment of counsel for the Underwriters at
     any time prior to the expiration of nine months after the date of this
     Agreement and if at such time any event shall have occurred as a result of
     which the Prospectus would include an untrue statement of a material fact
     or omit to state any material fact necessary in order to make the
     statements therein, in the light of the circumstances under which they were
     made when such Prospectus is delivered, not misleading, or, if for any
     other reason it shall be necessary during such same period to amend or
     supplement the Prospectus or to file under the Exchange Act any document
     incorporated by reference in the Prospectus in order to comply with the Act
     or the Exchange Act, to notify you and upon your request to file such
     document and to prepare and furnish without charge to each Underwriter and
     to any dealer in securities as many copies as you may from time to time
     reasonably request of an amended Prospectus or a supplement to the
     Prospectus which will correct such statement or omission or effect such
     compliance, and in case any Underwriter is required to deliver a prospectus
     in connection with sales of any of the Notes at any time nine months or
     more after the date of this Agreement, upon your request but at the expense
     of such Underwriter, to prepare and deliver to such Underwriter as many
     copies as you may request of an amended or supplemented Prospectus
     complying with Section 10(a)(3) of the Act;
 
          (d) To make generally available to its securityholders as soon as
     practicable, but in any event not later than eighteen months after the
     effective date of the Registration Statement (as defined in Rule 158(c)
     under the Act), an earnings statement of the Company and its subsidiaries
     (which need not be audited) complying with Section 11(a) of the Act and the
     rules and regulations of the Commission thereunder (including at the option
     of the Company Rule 158);
 
          (e) During the period beginning from the date hereof and continuing to
     and including the earlier of (i) the termination of trading restrictions on
     the Notes as notified to the Company by you and (ii) the Time of Delivery,
     not to offer, sell, contract to sell or otherwise dispose of debt
     securities of the Company which mature more than one year after the Time of
     Delivery and which are substantially similar to the Notes, except (x) with
     your prior written consent, (y) as described in the Prospectus or (z)
     pursuant to borrowings under the Company's credit facilities or other lines
     of credit established by the Company prior to the date hereof;
 
          (f) To furnish to the holders of the Notes as soon as practicable
     after the end of each fiscal year an annual report (including a balance
     sheet and statements of income, stockholders' equity and cash flows of the
     Company and its consolidated subsidiaries certified by independent public
     accountants) and, as soon as practicable after the end of each of the first
     three quarters of each fiscal year (beginning with the fiscal quarter
     ending after the effective date of the Registration Statement),
     consolidated summary financial information of the Company and its
     subsidiaries for such quarter in reasonable detail; and
 
          (g) During a period of three years from the effective date of the
     Registration Statement, to furnish to you copies of all reports or other
     communications (financial or other) furnished to stockholders, and deliver
     to you (i) as soon as they are available, copies of any reports and
     financial statements furnished to or filed with the Commission or any
     national securities exchange on which any class of securities of the
     Company is listed; and (ii) such additional information concerning the
     business and financial condition of the Company as you may from time to
     time reasonably request (such financial statements to be on a consolidated
     basis to the extent the accounts of the Company and its subsidiaries are
     consolidated in reports furnished to its stockholders generally or to the
     Commission).
 
     6. The Company covenants and agrees with the several Underwriters that it
will pay or cause to be paid the following: (i) the fees, disbursements and
expenses of the Company's counsel and accountants in connection with the
registration of the Notes under the Act and all other expenses in connection
with the preparation, printing and filing of the Registration Statement, any
preliminary prospectus and the Prospectus and amendments and supplements thereto
and the mailing and delivering of copies thereof to the Underwriters and
dealers; (ii) the cost of printing or producing this Agreement, the Indenture,
the Blue Sky Memorandum and any other documents in connection with the offering,
purchase, sale and delivery of the Notes; (iii) all expenses in connection with
the qualification of the Notes for offering and sale under state securities laws
as
                                        5
<PAGE>   6
 
provided in Section 5(b) hereof, including the fees and disbursements of counsel
for the Underwriters in connection with such qualification and in connection
with the Blue Sky survey; (iv) any fees charged by securities rating services
for rating the Notes; (v) the filing fees incident to securing any required
review by the National Association of Securities Dealers, Inc. of the terms of
the sale of the Notes; (vi) the costs of preparing and delivering the Notes to
the Underwriters, including any capital, stamp or other tax or duty payable upon
the issuance of the Notes; (vii) the fees and expenses of the Trustee and any
agent of the Trustee and the fees and disbursements of counsel for the Trustee
in connection with the Indenture and the Notes; (viii) all expenses and listing
fees in connection with the listing of the Notes on the New York Stock Exchange;
and (ix) all other costs and expenses incident to the performance of its
obligations hereunder which are not otherwise specifically provided for in this
Section. It is understood, however, that except as provided in this Section,
Section 8 and Section 11 hereof, you will pay all of your own costs and
expenses, including the fees of your counsel, transfer taxes on resale of any of
the Notes by you, and any advertising expenses connected with any offers you may
make.
 
     7. The obligations of the Underwriters hereunder shall be subject, in their
discretion, to the condition that all representations and warranties and other
statements of the Company herein are, at and as of such Time of Delivery, true
and correct, the condition that the Company shall have performed all of its
obligations hereunder theretofore to be performed, and the following additional
conditions:
 
          (a) The Prospectus Supplement shall have been filed with the
     Commission pursuant to Rule 424(b) within the applicable time period
     prescribed for such filing by the rules and regulations under the Act and
     in accordance with Section 5(a) hereof; no stop order suspending the
     effectiveness of the Registration Statement or any part thereof shall have
     been issued and no proceeding for that purpose shall have been initiated or
     threatened by the Commission; and all requests for additional information
     on the part of the Commission shall have been complied with to your
     reasonable satisfaction;
 
          (b) Simpson Thacher & Bartlett, counsel for the Underwriters, shall
     have furnished to you such opinion or opinions, dated such Time of
     Delivery, with respect to the incorporation of the Company, the
     authorization of this Agreement and the Indenture, the validity of the
     Notes, the Registration Statement, the Prospectus and other related matters
     as you may reasonably request, and such counsel shall have received such
     papers and information as they may reasonably request to enable them to
     pass upon such matters;
 
          (c) King & Spalding, counsel for the Company, shall have furnished to
     you its written opinion, dated such Time of Delivery, in form and substance
     satisfactory to you, to the effect that:
 
             (i) The Company has been duly incorporated and is validly existing
        as a corporation in good standing under the laws of the State of
        Delaware, with requisite corporate power and authority to own its
        properties and conduct its business as described in the Prospectus;
 
             (ii) The Company has been duly qualified as a foreign corporation
        for the transaction of business and is in good standing under the laws
        of each other jurisdiction in which it owns or leases a material amount
        of properties, or conducts any material business, so as to require such
        qualification, or is subject to no material liability or disability by
        reason of failure to be so qualified in any such jurisdiction (such
        counsel being entitled to rely in respect of matters of fact upon
        certificates of public officials or officers of the Company, provided
        that such counsel shall state that they believe that both you and they
        are justified in relying upon such certificates);
 
             (iii) Each Material Subsidiary has been duly incorporated and is
        validly existing as a corporation in good standing under the laws of its
        jurisdiction of incorporation; to the best of such counsel's knowledge
        after reasonable investigation, Unimar has been duly formed and is
        validly existing as a partnership under the laws of the State of Texas;
        and all of the issued shares of capital stock of each Material
        Subsidiary have been duly and validly authorized and issued and are
        fully paid and non-assessable, and (except for directors' qualifying
        shares and shares held by third parties solely to satisfy local law
        requirements and except as otherwise set forth in the Prospectus), to
        the best of such counsel's knowledge after reasonable investigation and
        except as set forth in a schedule
 
                                        6
<PAGE>   7
 
        to such counsel's opinion, all of such shares of capital stock and 50%
        of the equity interests in Unimar are owned directly or indirectly by
        the Company, free and clear of all liens, encumbrances, equities or
        claims within the meaning of the Uniform Commercial Code (such counsel
        being entitled to (A) state that the opinion in this clause relating to
        the ownership of capital stock and equity interests is based solely on a
        review of the corporate records of the Company and its subsidiaries and
        the records of Unimar, the certificate or certificates representing such
        shares of capital stock and evidence of such equity interests in Unimar,
        and a certificate or certificates in respect of matters of fact as to
        ownership of and liens, encumbrances, equities or claims on such shares
        of capital stock and equity interests, provided that such counsel shall
        state that they believe that both you and they are justified in relying
        upon such certificate or certificates and (B) rely in respect of matters
        of fact upon certificates of public officials or officers of the Company
        or its subsidiaries furnished to you at such Time of Delivery, provided
        that such counsel shall state that they believe that both you and they
        are justified in relying upon such certificates);
 
             (iv) To the best of such counsel's knowledge after reasonable
        investigation, other than as set forth in the Prospectus, there is no
        pending or threatened action, suit or proceeding before any court or any
        governmental agency or body or any arbitrator involving the Company, any
        Material Subsidiary or Unimar required to be disclosed in the
        Registration Statement that is not adequately disclosed therein;
 
             (v) This Agreement has been duly authorized, executed and delivered
        by the Company;
 
             (vi) The Notes have been duly authorized, executed, issued and
        delivered by the Company and, assuming the due authentication thereof by
        the Trustee, constitute valid and legally binding obligations of the
        Company entitled to the benefits provided by the Indenture; and the
        Notes and the Indenture conform to the descriptions thereof in the
        Prospectus;
 
             (vii) The Indenture has been duly authorized, executed and
        delivered by the Company and, assuming the due authorization, execution
        and delivery thereof by the Trustee, constitutes a valid and legally
        binding instrument of the Company, enforceable against the Company in
        accordance with its terms, subject to the effects of bankruptcy,
        insolvency, fraudulent conveyance, reorganization, moratorium and other
        similar laws relating to or affecting creditors' rights generally,
        general equitable principles (whether considered in a proceeding in
        equity or at law) and an implied covenant of good faith and fair
        dealing; and the Indenture has been duly qualified under the Trust
        Indenture Act;
 
             (viii) The issue and sale of the Notes and the compliance by the
        Company with all of the provisions of the Notes, the Indenture and this
        Agreement and the consummation of the transactions herein and therein
        contemplated will not result in any violation of the Restated
        Certificate of Incorporation or By-laws of the Company and, to the best
        of such counsel's knowledge after reasonable investigation, such action
        will not result in a breach or violation of any of the terms or
        provisions of, or constitute a default under, any indenture, mortgage,
        deed of trust, loan agreement or other agreement or instrument to which
        the Company or any of its Material Subsidiaries or, to the best of such
        counsel's knowledge, Unimar is a party or by which the Company or any of
        its Material Subsidiaries or, to the best of such counsel's knowledge,
        Unimar is bound or to which any of the property or assets of the Company
        or any of its Material Subsidiaries or, to the best of such counsel's
        knowledge, Unimar is subject, or any statute or any order, rule or
        regulation known to such counsel of any court or governmental agency or
        body having jurisdiction over the Company, any of its Material
        Subsidiaries or, to the best of such counsel's knowledge, Unimar or any
        of their properties (excluding breaches, violations and defaults that,
        individually or in the aggregate, will not have any material adverse
        effect on the general affairs, management, financial position,
        stockholders' equity, results of operations or prospects of the Company
        and its subsidiaries taken as a whole);
 
             (ix) No consent, approval, authorization, order, registration or
        qualification of or with any such court or governmental agency or body
        having jurisdiction over the Company is required for the consummation by
        the Company of the transactions contemplated by this Agreement or the
                                        7
<PAGE>   8
 
        Indenture, except such as have been obtained under the Act and the Trust
        Indenture Act, and such consents, approvals, authorizations,
        registrations or qualifications as may be required under state or
        foreign securities or Blue Sky laws in connection with the purchase and
        distribution of the Notes by the Underwriters;
 
             (x) The statements made in the Prospectus under the captions
        "Description of the MAPS" and "Description of the Debt Securities"
        insofar as such statements constitute summaries of the legal matters and
        documents referred to therein, fairly present the information called for
        with respect to such legal matters and documents and fairly summarize
        such legal matters and documents;
 
             (xi) The Company is not an "investment company" within the meaning
        of the Investment Company Act and the published rules and regulations of
        the Commission thereunder, and no registration of the Company under the
        Investment Company Act is required for, or will be required as a
        consequence of, the issuance, offer and sale of the Notes pursuant to
        this Agreement;
 
             (xii) The documents incorporated by reference in the Prospectus or
        any amendment or supplement thereto made by the Company prior to such
        Time of Delivery (other than the financial statements and related
        schedules and engineering and statistical data therein, as to which such
        counsel need express no opinion), when they became effective or were
        filed with the Commission, as the case may be, complied as to form in
        all material respects with the requirements of the Act or the Exchange
        Act, as applicable, and the published rules and regulations of the
        Commission thereunder; and
 
             (xiii) The Registration Statement and the Prospectus and any
        amendments and supplements thereto made by the Company prior to such
        Time of Delivery (other than the financial statements and related
        schedules and engineering and statistical data therein, as to which such
        counsel need express no opinion) comply as to form in all material
        respects with the requirements of the Act and the Trust Indenture Act
        and the published rules and regulations of the Commission thereunder.
 
          Such counsel shall state that, although they do not assume any
     responsibility for the accuracy, completeness or fairness of the statements
     contained in any of the documents referred to in subclause (xii) of this
     Clause (c) or in the Registration Statement or the Prospectus (except as
     and to the extent described in subclause (x) of this Clause (c)), they have
     no reason to believe that (i) any of the documents referred to in subclause
     (xii) of this Clause (c) when such documents became effective or were so
     filed, as the case may be, contained an untrue statement of a material
     fact, or omitted to state a material fact required to be stated therein or
     necessary to make the statements therein not misleading, or, in the case of
     other documents which were filed under the Exchange Act with the
     Commission, an untrue statement of a material fact, or omitted to state a
     material fact required to be stated therein or necessary in order to make
     the statements therein, in the light of the circumstances under which they
     were made when such documents were so filed, not misleading; or (ii) as of
     its effective date, the Registration Statement or any amendment thereto
     made by the Company prior to such Time of Delivery (other than the
     financial statements and related schedules therein, as to which such
     counsel need express no opinion or belief) contained an untrue statement of
     a material fact or omitted to state a material fact required to be stated
     therein or necessary to make the statements therein not misleading or that,
     as of its date, the Prospectus or any amendment or supplement thereto made
     by the Company prior to such Time of Delivery (other than the financial
     statements and related schedules therein, as to which such counsel need
     express no opinion or belief) contained an untrue statement of a material
     fact or omitted to state a material fact necessary to make the statements
     therein, in the light of the circumstances under which they were made, not
     misleading or that, as of such Time of Delivery, either the Registration
     Statement or the Prospectus or any amendment or supplement thereto made by
     the Company prior to such Time of Delivery (other than the financial
     statements and related schedules therein, as to which such counsel need
     express no opinion or belief) contains an untrue statement of a material
     fact or omits to state a material fact necessary to make the statements
     therein, in the light of the circumstances under which they were made, not
     misleading; and such counsel does not know of any amendment to the
     Registration Statement required to be filed or of any contracts or other
     documents of a character required to be filed as
                                        8
<PAGE>   9
 
     an exhibit to the Registration Statement or required to be incorporated by
     reference into the Prospectus or any amendment or supplement thereto or
     required to be described in the Registration Statement or the Prospectus or
     any amendment or supplement thereto which are not filed or incorporated by
     reference or described as required.
 
          In rendering the opinions referred to in subclauses (ii), (iii), (iv),
     (viii) and (ix) of this Clause (c), such counsel may rely upon an opinion
     of Alan R. Crain, Jr., Esq., Vice President and General Counsel of the
     Company, furnished to you at such Time of Delivery, provided that such
     counsel shall state that it believes that both you and it are justified in
     relying upon such opinion.
 
          In rendering such opinion, such counsel may state that it expresses no
     opinion as to the laws of any jurisdiction other than the Federal laws of
     the United States, the laws of the State of New York and the State of Texas
     and the General Corporation Law of the State of Delaware.
 
          (d) On the date of execution hereof and at the Time of Delivery, Price
     Waterhouse LLP shall have furnished to you a letter, dated the respective
     dates thereof, in form and substance satisfactory to you, to the effect set
     forth in Annex I hereto;
 
          (e)(i) None of the Company or any of its subsidiaries or Unimar shall
     have sustained since the date of the latest audited financial statements
     included or incorporated by reference in the Prospectus any loss or
     interference with its business from fire, explosion, flood or other
     calamity, whether or not covered by insurance, or from any labor dispute or
     court or governmental action, order or decree, otherwise than as set forth
     or contemplated in the Prospectus, which loss or interference is material
     to the Company and its subsidiaries taken as a whole, and (ii) since the
     respective dates as of which information is given in the Prospectus there
     shall not have been any change in the capital stock (other than (A) any
     shares of capital stock of the Company sold upon the exercise of a
     subscription, option or warrant or the conversion of a security outstanding
     on the date of this Agreement or (B) any shares of such capital stock, or
     other securities convertible or exercisable or exchangeable for such
     shares, in either case issued pursuant to any employee stock option,
     benefit or deferred compensation plan of the Company existing on the date
     of this Agreement) or any increase of more than $75,000,000 in the
     consolidated short-term or long-term debt of the Company or any change, or
     any development involving a prospective change, in or affecting the general
     affairs, management, financial position, stockholders' equity or results of
     operations of the Company and its subsidiaries taken as a whole, otherwise
     than as set forth or contemplated in the Prospectus, the effect of which,
     in any such case described in Clause (i) or (ii), is in your judgment so
     material and adverse as to make it impracticable or inadvisable to proceed
     with the public offering or the delivery of the Notes being delivered at
     such Time of Delivery on the terms and in the manner contemplated in the
     Registration Statement or the Prospectus or any amendment or supplement
     thereto;
 
          (f) On or after the date hereof (i) no downgrading shall have occurred
     in the rating accorded the Company's debt securities by any "nationally
     recognized statistical rating organization," as that term is defined by the
     Commission for purposes of Rule 436(g)(2) under the Act and (ii) no such
     organization shall have publicly announced that it has under surveillance
     or review, with possible negative implications, its rating of any of the
     Company's debt securities (other than Moody's Investors Services, Inc.'s
     "negative outlook" on its rating of the Company's debt securities, which
     outlook was publicly announced prior to the date hereof);
 
          (g) On or after the date hereof there shall not have occurred any of
     the following: (i) a suspension or material limitation in trading in
     securities generally on the New York Stock Exchange; (ii) a general
     moratorium on commercial banking activities in New York declared by either
     Federal or New York State authorities; or (iii) the outbreak or escalation
     of hostilities involving the United States or the declaration by the United
     States of a national emergency or war if the effect of any such event
     specified in this Clause (iii) in your judgment makes it impracticable or
     inadvisable to proceed with the public offering or the delivery of the
     Notes on the terms and in the manner contemplated in the Prospectus; and
 
          (h) The Company shall have furnished or caused to be furnished to you
     at such Time of Delivery certificates of the Company (executed by
     appropriate officers of the Company) satisfactory to you as to
 
                                        9
<PAGE>   10
 
     the accuracy of the representations and warranties of the Company herein at
     and as of such Time of Delivery, as to the performance by the Company of
     all of its respective obligations hereunder to be performed at or prior to
     such Time of Delivery, and as to such other matters as you may reasonably
     request, and the Company shall have furnished or caused to be furnished
     certificates as to the matters set forth in subsections (a) and (e) of this
     Section, and as to such other matters as you may reasonably request.
 
     8. (a) The Company will indemnify and hold harmless each Underwriter
against any losses, claims, damages or liabilities, joint or several, to which
such Underwriter may become subject, under the Act or otherwise, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise out
of or are based upon an untrue statement or alleged untrue statement of a
material fact contained in the Registration Statement, the Prospectus, the
Prospectus Supplement, the related preliminary Prospectus Supplement, or any
amendment or supplement thereto, or arise out of or are based upon the omission
or alleged omission to state therein a material fact required to be stated
therein or necessary to make the statements therein not misleading, and will
reimburse each Underwriter for any legal or other expenses reasonably incurred
by such Underwriter in connection with investigating or defending any such
action or claim as such expenses are incurred; provided, however, that the
Company shall not be liable in any such case to the extent that any such loss,
claim, damage or liability arises out of or is based upon an untrue statement or
alleged untrue statement or omission or alleged omission made in the
Registration Statement, the Prospectus, the Prospectus Supplement, the related
preliminary Prospectus Supplement, or any such amendment or supplement in
reliance upon and in conformity with written information furnished to the
Company by such Underwriter expressly for use therein; and provided, further,
that the Company shall not be liable to any Underwriter under the indemnity
agreement in this subsection (a) with respect to any preliminary prospectus to
the extent that any such loss, claim, damage or liability of such Underwriter
results from the fact that such Underwriter sold Notes to a person as to whom it
shall be established that there was not sent or given, at or prior to the
written confirmation of such sale, a copy of the Prospectus (excluding documents
incorporated by reference) or of the Prospectus as then amended or supplemented
(excluding documents incorporated by reference) in any case where such delivery
is required by the Act if the Company has previously furnished copies thereof to
such Underwriter and the loss, claim, damage or liability of such Underwriter
results from an untrue statement or omission of a material fact contained in the
preliminary prospectus which was corrected in the Prospectus (excluding
documents incorporated by reference) or in the Prospectus as then amended or
supplemented (excluding documents incorporated by reference).
 
          (b) Each Underwriter will indemnify and hold harmless the Company
     against any losses, claims, damages or liabilities to which the Company may
     become subject, under the Act or otherwise, insofar as such losses, claims,
     damages or liabilities (or actions in respect thereof) arise out of or are
     based upon an untrue statement or alleged untrue statement of a material
     fact contained in the Registration Statement, the Prospectus, the
     Prospectus Supplement, the related preliminary Prospectus Supplement, or
     any amendment or supplement thereto, or arise out of or are based upon the
     omission or alleged omission to state therein a material fact required to
     be stated therein or necessary to make the statements therein not
     misleading, in each case to the extent, but only to the extent, that such
     untrue statement or alleged untrue statement or omission or alleged
     omission was made in the Registration Statement, the Prospectus, the
     Prospectus Supplement, the related preliminary Prospectus Supplement, or
     any such amendment or supplement, in reliance upon and in conformity with
     written information furnished to the Company by such Underwriter expressly
     for use therein; and will reimburse the Company for any legal or other
     expenses reasonably incurred by the Company in connection with
     investigating or defending any such action or claim as such expenses are
     incurred.
 
          (c) Promptly after receipt by a party entitled to indemnification
     under subsection (a) or (b) above (the "indemnified party") of notice of
     the commencement of any action, such indemnified party shall, if a claim in
     respect thereof is to be made against a party required to provide
     indemnification to such indemnified party under such subsection (the
     "indemnifying party"), notify the indemnifying party in writing of the
     commencement thereof; but the omission so to notify the indemnifying party
     shall not relieve it from any liability which it may have to any
     indemnified party otherwise than under such
                                       10
<PAGE>   11
 
     subsection. In case any such action shall be brought against any
     indemnified party and it shall notify the indemnifying party of the
     commencement thereof, the indemnifying party shall be entitled to
     participate therein and, to the extent that it shall wish, jointly with any
     other indemnifying party similarly notified, to assume the defense thereof,
     with counsel satisfactory to such indemnified party (which shall not,
     except with the consent of the indemnified party, be counsel to the
     indemnifying party), and, after notice from the indemnifying party to such
     indemnified party of its election so to assume the defense thereof, the
     indemnifying party shall not be liable to such indemnified party under such
     subsection for any legal expenses of other counsel or any other expenses,
     in each case subsequently incurred by such indemnified party, in connection
     with the defense thereof other than reasonable costs of investigation. In
     no event shall an indemnifying party be liable for the fees and expenses of
     more than one counsel (in addition to any local counsel), apart from
     counsel to such indemnifying party, for all indemnified parties in
     connection with any one action or separate but similar or related actions
     arising out of the same general allegations or circumstances. No
     indemnifying party shall be liable for any settlement of any such action
     effected without its consent, provided that such consent is not
     unreasonably withheld or delayed.
 
          (d) If the indemnification provided for in this Section 8 is
     unavailable to or insufficient to hold harmless an indemnified party under
     subsection (a) or (b) above in respect of any losses, claims, damages or
     liabilities (or actions in respect thereof) referred to therein, then each
     indemnifying party shall contribute to the amount paid or payable by such
     indemnified party as a result of such losses, claims, damages or
     liabilities (or actions in respect thereof) in such proportion as is
     appropriate to reflect the relative benefits received by the Company on the
     one hand and the Underwriters on the other from the offering of the Notes.
     If, however, the allocation provided by the immediately preceding sentence
     is not permitted by applicable law or if the indemnified party failed to
     give the notice required under subsection (c) above, then each indemnifying
     party shall contribute to such amount paid or payable by such indemnified
     party in such proportion as is appropriate to reflect not only such
     relative benefits but also the relative fault of the Company on the one
     hand and the Underwriters on the other in connection with the statements or
     omissions which resulted in such losses, claims, damages or liabilities (or
     actions in respect thereof), as well as any other relevant equitable
     considerations. The relative benefits received by the Company on the one
     hand and the Underwriters on the other shall be deemed to be in the same
     proportion as the total net proceeds from the offering of the Notes
     purchased under this Agreement (before deducting expenses) received by the
     Company on the one hand bear to the total underwriting discounts and
     commissions received by the Underwriters on the other with respect to the
     Notes purchased under this Agreement, in each case as set forth in the
     table on the cover page of the Prospectus Supplement. The relative fault
     shall be determined by reference to, among other things, whether the untrue
     or alleged untrue statement of a material fact or the omission or alleged
     omission to state a material fact relates to information supplied by the
     Company on the one hand or the Underwriters on the other and the parties'
     relative intent, knowledge, access to information and opportunity to
     correct or prevent such statement or omission. The Company and the
     Underwriters agree that it would not be just and equitable if contributions
     pursuant to this subsection (d) were determined by pro rata allocation
     (even if the Underwriters were treated as one entity for such purpose) or
     by any other method of allocation which does not take account of the
     equitable considerations referred to above in this subsection (d). The
     amount paid or payable by an indemnified party as a result of the losses,
     claims, damages or liabilities (or actions in respect thereof) referred to
     above in this subsection (d) shall be deemed to include any legal or other
     expenses reasonably incurred by such indemnified party in connection with
     investigating or defending any such action or claim. Notwithstanding the
     provisions of this subsection (d), (i) no Underwriter shall be required to
     contribute any amount in excess of the amount by which the total price at
     which the Notes underwritten by it and distributed to the public were
     offered to the public exceeds the amount of any damages which such
     Underwriter has otherwise been required to pay by reason of such untrue or
     alleged untrue statement or omission or alleged omission. No person guilty
     of fraudulent misrepresentation (within the meaning of Section 11(f) of the
     Act) shall be entitled to contribution from any person who was not guilty
     of such fraudulent misrepresentation. The Underwriters' obligations in this
     subsection (d) to contribute are several in proportion to their respective
     underwriting obligations and not joint.
 
                                       11
<PAGE>   12
 
          (e) The obligations of the Company under this Section 8 shall be in
     addition to any liability which the Company may otherwise have and shall
     extend, upon the same terms and conditions, to each person, if any, who
     controls any Underwriter within the meaning of the Act; and the obligations
     of the Underwriters under this Section 8 shall be in addition to any
     liability which the respective Underwriters may otherwise have and shall
     extend, upon the same terms and conditions, to each officer and director of
     the Company and to each person, if any, who controls the Company within the
     meaning of the Act.
 
     9. (a) If any Underwriter shall default in its obligation to purchase the
Notes which it has agreed to purchase hereunder at the Time of Delivery, you may
in your discretion arrange for you or another party or other parties to purchase
such Notes on the terms contained herein. If within thirty-six hours after such
default by any Underwriter you do not arrange for the purchase of such Notes,
then the Company shall be entitled to a further period of thirty-six hours
within which to procure another party or other parties satisfactory to you to
purchase such Notes on such terms. In the event that, within the respective
prescribed periods, you notify the Company that you have so arranged for the
purchase of such Notes, or the Company notifies you that it has so arranged for
the purchase of such Notes, you or the Company shall have the right to postpone
such Time of Delivery for a period of not more than seven days in order to
effect whatever changes may thereby be made necessary in the Registration
Statement or the Prospectus, or in any other documents or arrangements, and the
Company agrees to file promptly any amendments to the Registration Statement or
the Prospectus which in your opinion and the opinion of the Company may thereby
be made necessary. The term "Underwriter" as used in this Agreement shall
include any person substituted under this Section 9 with like effect as if such
person had originally been a party to this Agreement with respect to such Notes.
 
          (b) If, after giving effect to any arrangements for the purchase of
     the Notes of a defaulting Underwriter or Underwriters by you and the
     Company as provided in subsection (a) above, the aggregate principal amount
     of such Notes which remains unpurchased does not exceed one-eleventh of the
     aggregate principal amount of all the Notes to be purchased hereunder, then
     the Company shall have the right to require each non-defaulting Underwriter
     to purchase the aggregate principal amount of Notes which such Underwriter
     agreed to purchase hereunder and, in addition, to require each
     non-defaulting Underwriter to purchase its pro rata share (based on the
     aggregate principal amount of Notes which such Underwriter agreed to
     purchase hereunder) of the Notes of such defaulting Underwriter or
     Underwriters for which such arrangements have not been made; but nothing
     herein shall relieve a defaulting Underwriter from liability for its
     default.
 
          (c) If, after giving effect to any arrangements for the purchase of
     the Notes of one or more defaulting Underwriters by you and the Company as
     provided in subsection (a) above, the aggregate principal amount of Notes
     which remains unpurchased exceeds one-eleventh of the aggregate principal
     amount of all the Notes to be purchased hereunder, or if the Company shall
     not exercise the right described in subsection (b) above to require
     non-defaulting Underwriters to purchase Notes of one or more defaulting
     Underwriters, then this Agreement shall thereupon terminate, without
     liability on the part of any non-defaulting Underwriter or the Company,
     except for the expenses to be borne by the Company and the Underwriters as
     provided in Section 6 hereof and the indemnity and contribution agreements
     in Section 8 hereof; but nothing herein shall relieve a defaulting
     Underwriter from liability for its default.
 
     10. The respective indemnities, agreements, representations, warranties and
other statements of the Company and the several Underwriters as set forth in
this Agreement or made by or on behalf of them pursuant to this Agreement shall
remain in full force and effect, regardless of any investigation (or any
statement as to the results thereof) made by or on behalf of any Underwriter or
any controlling person of any Underwriter, or the Company, or any officer or
director or controlling person of the Company, and shall survive delivery of and
payment for the Notes.
 
     11. If this Agreement shall be terminated pursuant to Section 9 hereof, the
Company shall have no liability to any Underwriter except as provided in Section
6 and Section 8 hereof; but, if for any other reason any Notes are not delivered
by or on behalf of the Company as provided herein, the Company will reimburse
 
                                       12
<PAGE>   13
 
the Underwriters for all of their out-of-pocket expenses, including fees and
disbursements of counsel, reasonably incurred by the Underwriters in making
preparations for the purchase, sale and delivery of the Notes not so delivered,
but the Company shall then be under no further liability to any Underwriter in
respect of the Notes not so delivered except as provided in Section 6 and
Section 8 hereof.
 
     12. In all dealings hereunder, you shall act on behalf of each of the
Underwriters, and the parties hereto shall be entitled to act and rely upon any
statement, request, notice or agreement on behalf of any Underwriter made or
given by you.
 
     All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex or
facsimile transmission to Salomon Brothers Inc, 388 Greenwich Street, New York,
New York 10013, Attention: [       ] and if to the Company shall be delivered or
sent by mail, telex or facsimile transmission to the address of the Company set
forth in the Registration Statement, Attention: Secretary. Any such statements,
requests, notices or agreements shall take effect upon receipt thereof.
 
     13. This Agreement shall be binding upon, and inure solely to the benefit
of, the Underwriters and the Company and, to the extent provided in Sections 8
and 10 hereof, the officers and directors of the Company and each person who
controls the Company or any Underwriter, and their respective heirs, executors,
administrators, successors and assigns, and no other person shall acquire or
have any right under or by virtue of this Agreement. No purchaser of any Notes
from any Underwriter shall be deemed a successor or assign by reason merely of
such purchase.
 
     14. Time shall be of the essence of this Agreement. As used herein, the
term "business day" shall mean any day when the Commission's office in
Washington, D.C. is open for business.
 
     15. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF NEW YORK.
 
     16. This Agreement may be executed by any one or more of the parties hereto
in any number of counterparts, each of which shall be deemed to be an original,
but all such counterparts shall together constitute one and the same instrument.
 
                                       13
<PAGE>   14
 
     If the foregoing is in accordance with your understanding, please sign and
return to us nine counterparts hereof, and upon the acceptance hereof by you,
this letter and such acceptance hereof shall constitute a binding agreement
among each of the Underwriters and the Company.
 
                                            Very truly yours,
 
                                            UNION TEXAS PETROLEUM
                                              HOLDINGS, INC.
 
                                            By:
                                              ----------------------------------
                                              Name: Larry Kalmbach
                                              Title: Vice President and Chief
                                                Financial Officer
 
CONFIRMED AND ACCEPTED,
  as of the date first above
written:
 
SALOMON BROTHERS INC
By:
 
    --------------------------------
          Authorized Signatory
 
CHASE SECURITIES INC.
 
By:
 
    --------------------------------
          Authorized Signatory
 
NATIONSBANC MONTGOMERY
SECURITIES LLC
 
By:
 
    --------------------------------
          Authorized Signatory
 
                                       14
<PAGE>   15
 
                                   SCHEDULE A
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL AMOUNT
                        UNDERWRITER                               OF NOTES
                        -----------                           ----------------
<S>                                                           <C>
Salomon Brothers Inc........................................
Chase Securities Inc........................................
NationsBanc Montgomery Securities LLC ......................
                                                               -------------
          Total.............................................   $
                                                               =============
</TABLE>
 
                                       15
<PAGE>   16
 
                                                                         ANNEX I
 
     Pursuant to Section 7(d) of the Underwriting Agreement, the accountants
shall furnish letters to the Underwriters to the effect that:
 
     (i) They are independent accountants with respect to the Company and its
subsidiaries within the meaning of the Act and the applicable published rules
and regulations thereunder;
 
     (ii) In their opinion, the consolidated financial statements provided
pursuant to Article 12 of Regulation S-X audited by them and incorporated by
reference in the Registration Statement or the Prospectus comply as to form in
all material respects with the applicable accounting requirements of the Act or
the Exchange Act, as applicable, and the applicable related published rules and
regulations thereunder with respect to Registration Statements on Form S-3;
 
     (iii) On the basis of limited procedures, not constituting an audit in
accordance with generally accepted auditing standards, consisting of a reading
of the latest available unaudited interim financial data of the Company and its
subsidiaries, a reading of the minute books of the Company and its subsidiaries
since the date of the latest audited financial statements incorporated by
reference in the Prospectus, inquiries of officials of the Company and its
subsidiaries responsible for financial and accounting matters regarding the
specified items for which representations are requested below, nothing came to
their attention as a result of the foregoing procedures that caused them to
believe that:
 
          (A) at the date of the latest available interim financial data and at
     a specified date not more than five days prior to the date of such letter,
     there have been any changes in the consolidated capital stock or any
     increase of more than $75,000,000 in the consolidated short-term or
     long-term debt of the Company and its subsidiaries, or any decreases in
     consolidated net current assets (working capital) or stockholders' equity
     or other items heretofore determined with the Underwriters, or any
     increases in any items heretofore determined with the Underwriters, in each
     case as compared with amounts shown in the latest balance sheet included or
     incorporated by reference in the Prospectus, except in each case for
     changes, increases or decreases which the Prospectus discloses have
     occurred or may occur or which are described in such letter; and
 
          (B) for the period from the date of the latest financial statements
     included or incorporated by reference in the Prospectus to the specified
     date referred to in Clause (A) there were any decreases in consolidated net
     revenues or income before taxes or the total or basic per share amounts of
     consolidated net income or other items heretofore determined with the
     Underwriters or any increases in any items heretofore determined with the
     Underwriters, in each case as compared with the comparable period of the
     preceding year, except in each case for increases or decreases which the
     Prospectus discloses have occurred or may occur or which are described in
     such letter; and
 
          (iv) In addition to the audit referred to in their report incorporated
     by reference in the Prospectus and the limited procedures, inspection of
     minute books, inquiries and other procedures referred to in paragraphs (ii)
     and (iii) above, they have carried out certain specified procedures, not
     constituting an audit in accordance with generally accepted auditing
     standards, with respect to certain information specified by the
     Underwriters of an accounting, financial or statistical nature which are
     derived from the general accounting records of the Company and its
     subsidiaries (which are subject to the Company's system of internal
     accounting controls), which appear in the Prospectus (excluding documents
     incorporated by reference) or in Part II of, or in exhibits and schedules
     to, the Registration Statement specified by the Underwriters or in
     documents incorporated by reference in the Prospectus, including
     information set forth in the Company's Annual Report on Form 10-K for the
     year ended December 31, 1997 under the captions: "Business", "Market for
     the Registrant's Common Equity and Related Stockholder Matters", "Selected
     Financial Data" and "Management's Discussion and Analysis of Financial
     Condition and Results of Operations", and have agreed certain of such
     information of an accounting, financial or statistical nature to: (a)
     unaudited financial statements or (b) schedules prepared by the Company and
     (x) agreed the amounts on the schedules to corresponding amounts appearing
     in the accounting records of the Company and (y) determined the schedules
     were mathematically correct, excluding any questions of legal
     interpretation.
 
                                       16
<PAGE>   17
 
                                                                        ANNEX II
 
                             MATERIAL SUBSIDIARIES
 
Union Texas Petroleum Energy Corporation
Union Texas International Corporation
Union Texas East Kalimantan Limited
Union Texas Petroleum Limited
Union Texas Britannia Limited
Union Texas Finance, Inc.
Union Texas Venezuela Limited
 
                                       17

<PAGE>   1
 
                                                                    EXHIBIT 4.13
 
                   FORM OF   % MANDATORY PUTABLE/REMARKETABLE
               SECURITIES (MAPS(SM)) DUE APRIL             , 2038
<PAGE>   2

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY ("DTC") (55 WATER STREET, NEW YORK, NEW YORK) TO THE
COMPANY (AS DEFINED BELOW) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE
OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO.
OR SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC AND ANY
PAYMENT IS MADE TO CEDE & CO., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR
VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.  UNLESS AND UNTIL IT IS EXCHANGED
IN WHOLE OR IN PART FOR SECURITIES IN CERTIFICATED FORM, THIS SECURITY MAY NOT
BE TRANSFERRED EXCEPT AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF
DTC TO DTC OR ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.

                      UNION TEXAS PETROLEUM HOLDINGS, INC.

        % MANDATORY PUTABLE/REMARKETABLE SECURITIES DUE 2038 (MAPS(SM))

CUSIP NO.:
No. 1                                                               $150,000,000

ORIGINAL ISSUE DATE:  April   , 1998

INTEREST RATE TO REMARKETING DATE:      %

REMARKETING DATE:  April   , 2008

INTEREST RATE TO MATURITY:  To be determined as provided herein and set forth
in the records of the Trustee

STATED MATURITY DATE:  April   , 2038

AUTHORIZED DENOMINATION:  $1,000 and integral multiples thereof

INTEREST PAYMENT DATES: April     and October





- ------------
"MAndatory Putable/remarketable Securities" and "MAPS(SM)" are service marks
owned by Salomon Brothers Inc.





                                       1
<PAGE>   3
         UNION TEXAS PETROLEUM HOLDINGS, INC., a Delaware corporation
(hereinafter called the "Company"), for value received, hereby promises to pay
to Cede & Co., a nominee of The Depository Trust Company ("DTC"), or its
registered assigns, upon presentation, the principal amount of One Hundred Fifty
Million Dollars ($150,000,000) on the Stated Maturity Date specified above (or
any earlier redemption date or repurchase date) (each such Stated Maturity Date,
redemption date or repurchase date being hereinafter referred to as the
"Maturity Date" with respect to the principal repayable on such date) and to pay
interest thereon, at the Interest Rate per annum specified above to April   ,
2008 (the "Remarketing Date"), and thereafter, subject to the terms and
conditions set forth herein, at the Interest Rate determined by the Remarketing
Dealer (as defined below) in accordance with the procedures set forth below (the
"Interest Rate to Maturity"), until the principal hereof is paid or duly made
available for payment. The Company will pay interest in arrears on each Interest
Payment Date, if any, specified above (each, an "Interest Payment Date"),
commencing October   , 1998, and on the Maturity Date. Interest on this MAPS 
will be computed on the basis of a 360-day year of twelve 30-day months.

         If, pursuant to the Remarketing Agreement, dated as of the date hereof
(the "Remarketing Agreement"), between Salomon Brothers Inc, as Remarketing
Dealer (the "Remarketing Dealer"), and the Company, the Remarketing Dealer
elects to remarket the MAPS, then, except as otherwise set forth herein, (i)
this MAPS shall be subject to mandatory tender to the Remarketing Dealer for
remarketing on the Remarketing Date, on the terms and subject to the conditions
set forth herein, and (ii) on and after the Remarketing Date, this MAPS shall
bear interest at the Interest Rate to Maturity determined by the Remarketing
Dealer in accordance with the procedures set forth in Section 3 herein.

         Interest on this MAPS will accrue from, and including, the immediately
preceding Interest Payment Date to which interest has been paid or duly
provided for (or from, and including, the Original Issue Date if no interest
has been paid or duly provided for) to, but excluding, the applicable Interest
Payment Date or the Maturity Date, as the case may be. The interest so payable,
and punctually paid or duly provided for, on any Interest Payment Date will,
subject to certain exceptions described herein, be paid to the person in whose
name this MAPS  (or one or more predecessors ) is registered at the close of
business on the fifteenth calendar day (whether or not a Business Day, as
defined below) immediately preceding such Interest Payment Date (the "Regular
Record Date"); provided, however, that interest payable on the Maturity Date
will be payable to the person to whom the principal hereof and premium, if any,
hereon shall be payable.  Any such interest not so punctually paid or duly
provided for ("Defaulted Interest") will forthwith cease to be payable to the
Holder on any Regular Record Date, and shall be paid to the person in whose
name this MAPS is registered at the close of business on a special record date
(the "Special Record Date") for the payment of such Defaulted Interest to be
fixed by the Trustee hereinafter referred to, of which notice shall be mailed,
first-class postage prepaid, to the Holder of this MAPS by the Trustee not less
than 10 days prior to such Special Record Date or may be paid at any time in
any other lawful manner not inconsistent with the requirements of any
securities exchange on which this MAPS may be listed, and upon such notice as
may be required by such exchange, all as more fully provided for in the
Indenture.

         Payment of principal, premium, if any, and interest in respect of this
MAPS due on the Maturity Date will be made in immediately available funds upon
presentation and surrender of this MAPS at the corporate trust office of the
Trustee maintained for that purpose in the Borough of Manhattan, The City of
New York, currently located c/o First Chicago Trust Company of New York, 14
Wall Street, Eighth Floor - Window 2, New York, New York, 10005, or at such
other paying agency in The City of New York, State of New York, as the Company
may determine.  Payment of interest due on any Interest Payment Date other than
the Maturity Date will be made by check mailed to the address of the person
entitled thereto as such address shall appear in the Security Register kept for
the MAPS pursuant to Section 305 of the Indenture.

         If any Interest Payment Date or the Maturity Date falls on a day that
is not a Business Day, the required payment of principal, premium, if any,
and/or interest shall be made on the next succeeding Business Day with the same
force and effect as if made on the date such payment was due, and no interest
shall accrue with respect to such payment for the period from and after such
Interest Payment Date or the Maturity Date, as the case may be.

         As used herein, "Business Day" means each Monday, Tuesday, Wednesday,
Thursday and Friday which is not  a day on which banking institutions in The
City of New York are authorized or required by law, regulation, executive





                                       2
<PAGE>   4
order or governmental decree to be closed.

         The Company is obligated to make payment of principal, premium, if
any, and interest in respect of this MAPS in U.S. Dollars.

         Reference is hereby made to the further provisions of this MAPS set
forth on the reverse hereof.

         Unless the Certificate of Authentication hereon has been executed by
the Trustee by  manual signature, this MAPS shall not be entitled to any
benefit under the Indenture or be valid or obligatory for any purpose.





                                       3
<PAGE>   5
         IN WITNESS WHEREOF, Union Texas Petroleum Holdings, Inc., has caused
this MAPS to be duly executed this    day of April, 1998.

                                  UNION TEXAS PETROLEUM HOLDINGS, INC.

                                  By:                                        
                                     ----------------------------------------
Attest:                              [Chairman/Vice President]


By:
                                                            
   ----------------------------------------
   [Secretary/Assistant Secretary]

   [SEAL]


TRUSTEE'S CERTIFICATE OF AUTHENTICATION:

This      % MAndatory Putable/remarketable Securities due 2038 (MAPS(SM)) is one
of the Securities of the series designated therein referred to in the
within-mentioned Indenture.

Dated: April   , 1998             THE FIRST NATIONAL BANK OF CHICAGO, as Trustee


                                  By:                                        
                                     ----------------------------------------
                                     Authorized Signatory





                                       4
<PAGE>   6
                         (Form of Reverse of Security)


                      UNION TEXAS PETROLEUM HOLDINGS, INC.

        % MANDATORY PUTABLE/REMARKETABLE SECURITIES DUE 2038 (MAPS(SM))


         1.      Indenture.  (a) This MAPS is one of a duly authorized issue of
debt securities of the Company (the "Securities") issued under an Indenture
dated as of March 15, 1995 as supplemented by a supplemental indenture dated as
of November 17, 1995 (the "Indenture"), among the Company, subsidiaries of the
Company named therein and The First National Bank of Chicago, as Trustee (herein
called the "Trustee," which term includes any successor Trustee under the
Indenture with respect to the MAPS), to which Indenture and all indentures
supplemental thereto reference is hereby made for a statement of the respective
rights, limitations of rights, duties and immunities thereunder of the Company,
the Trustee, and the Holders of the MAPS, and of the terms upon which the MAPS
are authenticated and delivered.  This Security is designated as "   % MAndatory
Putable/remarketable Securities Due 2038 (MAPS(SM))" which MAPS are limited to
$150,000,000 aggregate principal amount, subject to the provisions of the
Indenture.  All terms used but not defined in this MAPS shall have the meanings
assigned to such terms in the Indenture.  Except where the context otherwise
requires, all references in this MAPS to "herein" or "hereof" or similar terms
shall include the Indenture.

         (b)     The MAPS will be senior unsecured obligations of the Company.

         (c)     This MAPS is issuable only in registered form without coupons
in minimum denominations of U.S. $1,000 and integral multiples thereof.

         (d)     This MAPS will not be subject to any sinking fund.

         2.      Mandatory Tender.  Provided that on a Business Day not later
than 10 Business Days prior to the Remarketing Date the Remarketing Dealer
notifies the Company and the Trustee of its election to purchase the MAPS on
the Remarketing Date (the "Notification Date"), the MAPS shall be subject to
mandatory tender to the Remarketing Dealer, and the Remarketing Dealer shall be
obligated to purchase the MAPS, for remarketing on the Remarketing Date,
subject in each case to the conditions described herein and set forth in the
Remarketing Agreement.

         3.      Determination of Interest Rate to Maturity.  Subject to the
Remarketing Dealer's election to remarket the MAPS as provided in Section 2
hereof and the Remarketing Agreement, the Interest Rate to Maturity shall be
determined by the Remarketing Dealer by 3:30 p.m., New York City time, on and
as of the third Business Day immediately preceding the Remarketing Date (the
"Determination Date") to the nearest one hundred-thousandth (0.00001) of one
percent per annum, and will be equal to the sum of             % (the "Base
Rate") plus the Applicable Spread, which will be based on the Dollar Price of
the MAPS.

         The "Applicable Spread" will be the lowest firm commitment, expressed
as a spread (in the form of a percentage or in basis points) above the Base
Rate, obtained by the Remarketing Dealer on the Determination Date from the
bids quoted by five Reference Corporate Dealers for the full aggregate
principal amount of the MAPS at the Dollar Price, but assuming (i) an issue
date equal to the Remarketing Date, with settlement on such date without
accrued interest, (ii)  a maturity date equal to the Stated Maturity Date of
the MAPS, and (iii) a stated annual interest rate, payable semi-annually on
each Interest Payment Date, equal to the Base Rate plus the spread bid by the
applicable Reference Corporate Dealer.  If fewer than five Reference Corporate
Dealers bid as described above, then the Applicable Spread shall be the lowest
of such firm commitments obtained as described above.  The Interest Rate to
Maturity announced by the Remarketing Dealer, absent manifest error, shall be
binding and conclusive upon the beneficial owners and Holders of the MAPS, the
Company and the Trustee.

         "Dollar Price" means the present value, as of the Remarketing Date, of
the Remaining Scheduled Payments discounted to the Remarketing Date, on a
semi-annual basis (assuming a 360-day year consisting of twelve 30-day





                                       5
<PAGE>   7
months), at the Treasury Rate.

         "Reference Corporate Dealers" means each of Salomon Brothers Inc,
Chase Securities Inc., NationsBanc Montgomery Securities LLC, Merrill Lynch,
Pierce, Fenner & Smith Incorporated and J. P. Morgan Securities Inc. and their
respective successors; provided, however, that if any of the foregoing or their
affiliates shall cease to be a leading dealer of publicly traded debt
securities of the Company in The City of New York (a "Primary Corporate
Dealer"), the Remarketing Dealer shall substitute therefor another Primary
Corporate Dealer.

         "Remaining Scheduled Payments" means, with respect to the MAPS, the
remaining scheduled payments of the principal thereof and interest thereon,
calculated at the Base Rate only, that would be due after the Remarketing Date
to but excluding the Stated Maturity Date; provided, however, that if the
Remarketing Date is not an Interest Payment Date with respect to the MAPS, the
amount of the next succeeding scheduled interest payment thereon, calculated at
the Base Rate only, will be reduced by the amount of interest accrued thereon,
calculated at the Base Rate only, to the Remarketing Date.

         "Treasury Rate" means, with respect to the Remarketing Date, the rate
per annum equal to the semi-annual equivalent yield to maturity or interpolated
(on a day count basis) yield to maturity of the Comparable Treasury Issues,
assuming a price for the Comparable Treasury Issues (expressed as a percentage
of its principal amount), equal to the Comparable Treasury Price for the
Remarketing Date.

         "Comparable Treasury Issues" means the United States Treasury security
or securities selected by the Remarketing Dealer as having an actual or
interpolated maturity or maturities comparable to the remaining term of the
MAPS being remarketed.

         "Comparable Treasury Price" means, with respect to the Remarketing
Date, (a) the offer prices for the Comparable Treasury Issues (expressed in
each case as a percentage of its principal amount) on the Determination Date,
as set forth on "Telerate Page 500" (or such other page as may replace Telerate
Page 500), or (b) if such page (or any successor page) is not displayed or does
not contain such offer prices on the Determination Date, (i) the average of the
Reference Treasury Dealer Quotations for the Remarketing Date, after excluding
the highest and lowest of such Reference Treasury Dealer Quotations, or (ii) if
the Remarketing Dealer obtains fewer than four such Reference Treasury Dealer
Quotations, the average of all such Reference Treasury Dealer Quotations.
"Telerate Page 500" means the display designated as "Telerate Page 500" on Dow
Jones Markets Limited (or such other page as may replace Telerate Page 500 on
such service) or such other service displaying the offer prices specified in
(a) above as may replace Dow Jones Markets Limited.

         "Reference Treasury Dealer Quotations" means, with respect to each
Reference Treasury Dealer and the Remarketing Date, the offer prices for the
Comparable Treasury Issues (expressed in each case as a percentage of its
principal amount) quoted to the Remarketing Dealer by such Reference Treasury
Dealer by 3:30 p.m., New York City time, on the Determination Date.

         "Reference Treasury Dealer" means each of Salomon Brothers Inc, Chase
Securities Inc., NationsBanc Montgomery Securities LLC, Merrill Lynch, Pierce,
Fenner & Smith Incorporated and J. P. Morgan Securities Inc. and their
respective successors; provided, however, that if any of the foregoing or their
affiliates shall cease to be a primary U.S.  government securities dealer in
The City of New York (a "Primary Treasury Dealer"), the Remarketing Dealer
shall substitute therefor another Primary Treasury Dealer.

         4.      Repurchase.  In the event that (i) the Remarketing Dealer for
any reason does not notify the Company of the Interest Rate to Maturity by 4:00
p.m., New York City time, on the Determination Date, or (ii) prior to the
Remarketing Date, the Remarketing Dealer has resigned and no successor has been
appointed on or before the Determination Date, or (iii) since the Notification
Date, a material adverse change in the condition of the Company and its
subsidiaries, considered as one enterprise, shall have occurred or an Event of
Default, or any event which, with the giving of notice or passage of time, or
both, would constitute an Event of Default, with respect to the MAPS shall have
occurred and be continuing, or any other event constituting a termination event
under the Remarketing Agreement shall have occurred, or (iv) the Remarketing
Dealer elects not to remarket the MAPS, or (v) the Remarketing Dealer for any





                                       6
<PAGE>   8
reason does not purchase all tendered MAPS on the Remarketing Date, the Company
shall repurchase the MAPS as a whole on the Remarketing Date at a price equal
to 100% of the principal amount of the MAPS plus all accrued and unpaid
interest, if any, on the MAPS to the Remarketing Date.   In any such case,
payment will be made by the Company through the Trustee to the DTC participant
of each tendering beneficial owner of MAPS, by book-entry through DTC by the
close of business on the Remarketing Date against delivery through DTC of such
beneficial owner's tendered MAPS.

         5.      Redemption.   (a) This MAPS will be subject to redemption at
the option of the Company from the Remarketing Dealer on the Remarketing Date,
in whole but not in part, at the Remarketing Redemption Price.  To exercise its
option to redeem the MAPS, the Company must notify the Remarketing Dealer and
the Trustee not later than the Business Day immediately preceding the
Determination Date.  The "Remarketing Redemption Price" shall be the greater of
(i) 100% of the principal amount of the MAPS and (ii) the Dollar Price, plus in
either case any accrued and unpaid interest on the principal amount being
redeemed to the Remarketing Date.  If the Company elects to redeem the MAPS, it
shall pay the Remarketing Redemption Price therefor in same-day funds by wire
transfer to an account designated by the Remarketing Dealer on the Remarketing
Date.

         (b)     After the Remarketing Date, this MAPS shall be subject to
redemption at the option of the Company, at any time in whole or from time to
time in part, at the Optional Redemption Price.  The  "Optional Redemption
Price" shall be equal to the sum of (i) the principal amount of the MAPS being
redeemed, plus accrued and unpaid interest thereon to the applicable date fixed
for redemption (the "Redemption Date"), and (ii) the Make-Whole Premium, if
any.

         "Make-Whole Premium" shall mean, in connection with any optional
redemption of any MAPS, the excess, if any, of:

                 (i)      the sum of the present values, calculated as of the
                 Redemption Date, of:
        
                          (A)     each interest payment that, but for such
                 redemption, would have been payable on the MAPS (or portion
                 thereof) after the Redemption Date (excluding any accrued
                 interest for the period prior to the Redemption Date); and

                          (B)     the principal amount that, but for such
                 redemption, would have been payable at the final maturity of
                 the MAPS (or portion thereof) being redeemed;

                 over

                 (ii)     the principal amount of the MAPS (or portion thereof)
                 being redeemed,

plus any accrued and unpaid interest thereon to but excluding the Redemption
Date. The present values of interest and principal payments referred to in
clause (i) above will be determined in accordance with generally accepted
principles of financial analysis.  Such present values will be calculated by
discounting the amount of each payment of interest or principal from the date
that each such payment would have been payable, but for the redemption, to the
Redemption Date at a discount rate equal to the Treasury Yield (as defined below
for purposes of determining the Make-Whole Premium) plus     basis points.





                                       7
<PAGE>   9
         The Make-Whole Premium will be calculated by an independent investment
banking institution of national standing appointed by the Company; provided,
that if the Company fails to make such appointment at least 10 Business Days
prior to the Redemption Date, or if the institution so appointed is unwilling
or unable to make such calculation, such calculation will be made by [Salomon
Smith Barney] or, if such firm is unwilling or unable to make such calculation,
by an independent investment banking institution of national standing appointed
by the Trustee (in any such case, an "Independent Investment Banker").

         For purposes of determining the Make-Whole Premium, "Treasury Yield"
means a rate of interest per annum equal to the weekly average yield to
maturity of United States Treasury Notes that have a constant maturity that
corresponds to the remaining term to maturity of the MAPS, calculated to the
nearest 1/12 of a year (the "Remaining Term").  The Treasury Yield will be
determined as of the third Business Day immediately preceding the Redemption
Date.

         The weekly average yields of United States Treasury Notes will be
determined by reference to the most recent statistical release published by the
Federal Reserve Bank of New York and designated "H.15(519) Selected Interest
Rates" or any successor release (the "H.15 Statistical Release").  If the H.15
Statistical Release sets forth a weekly average yield for United States
Treasury Notes having a constant maturity that is the same as the Remaining
Term, then the Treasury Yield will be equal to such weekly average yield.  In
all other cases, the Treasury Yield will be calculated by interpolation, on a
straight-line basis, between the weekly average yields on the United States
Treasury Notes that have a constant maturity closest to and greater than the
Remaining Term and the United States Treasury Notes that have a constant
maturity closest to and less than the Remaining Term (in each case as set forth
in the H.15 Statistical Release).  Any weekly average yields so calculated by
interpolation will be rounded to the nearest 1/100 of 1%, with any figure of
1/200 of 1% or above being rounded upward.  If weekly average yields for United
States Treasury Notes are not available in the H.15 Statistical Release or
otherwise, then the Treasury Yield will be calculated by interpolation of
comparable rates selected by the Independent Investment Banker.

         Notice of any optional redemption of any MAPS shall be given to
Holders at their addresses, as shown in the security register for the MAPS, not
less than 30 nor more than 60 days prior to the date fixed for redemption.  The
notice of redemption shall specify, among other items, the Optional Redemption
Price and the principal amount of the MAPS held by such Holder to be redeemed.
If less than all of the MAPS are to be redeemed, the Trustee will select the
MAPS to be redeemed pro rata or by lot.  The Trustee may select for redemption
MAPS and portions of MAPS in amounts of $1,000 or whole multiples of $1,000,
provided that if all of the MAPS of a Holder are to be redeemed, the entire
outstanding amount of MAPS held by such Holder, even if not a whole multiple of
$1,000, will be redeemed.

         (c)     On and after the Redemption Date interest will cease to accrue
on the MAPS or on the portions thereof called for redemption, as the case may
be.

         6.      Defaults and Remedies.  Events of Default include: default in
payment of interest of the MAPS for 30 days; default in payment of principal of
or premium, if any, on the MAPS; failure by the Company for 60 days after
written notice by the Trustee or by the Holders of at least 25% of the
aggregate principal amount of the MAPS then outstanding to it to comply with
any of its other covenants or agreements in the Indenture or the MAPS; the
acceleration of the maturity of any Indebtedness of the Company or any
Restricted Subsidiary (other than the MAPS or any Non-Recourse Indebtedness)
that has an outstanding principal amount of $20 million or more individually or
in the aggregate; a default in the payment of principal or interest in respect
of any Indebtedness of the Company or any Restricted Subsidiary (other than the
MAPS or any Non-Recourse Indebtedness) having an outstanding principal amount
of $20 million or more individually or in the aggregate, and such default shall
be continuing for a period of 30 days without the Company or such Restricted
Subsidiary, as the case may be, effecting a cure of such default; or certain
events involving bankruptcy, insolvency or reorganization of the Company or any
Restricted Subsidiary.  If an Event of Default occurs and is continuing, the
Trustee or the Holders of at least 25% in principal amount of the
then-outstanding MAPS may declare the principal of, and premium, if any, and
interest of all the MAPS to be immediately due and payable, except that in the
case of an Event of Default arising from certain events of bankruptcy,
insolvency or reorganization of the Company or any Restricted Subsidiary, all
outstanding MAPS become due and payable immediately without further action or
notice.  The amount due and payable upon the acceleration of any MAPS is equal
to 100% of the principal amount thereof plus accrued interest to the day of
payment.  Holders may not enforce the Indenture or the





                                       8
<PAGE>   10
MAPS except as provided in the Indenture.  The Trustee may require indemnity
reasonably satisfactory to it before it enforces the Indenture or the MAPS.
Subject to certain limitations, Holders of a majority in principal amount of
the then outstanding MAPS may direct the Trustee in its exercise of any trust
or power.  The Trustee may withhold from Holders notice of any continuing
default (except a default in payment of principal or interest) if it determines
that withholding notice is in their interests.  The Company must furnish an
annual compliance certificate to the Trustee.

         7.      Amendment and Modification.  The Indenture permits, with
certain exceptions as therein provided, the amendment thereof and the
modification of the rights and obligations of the Company and the rights of the
Holders of the MAPS at any time by the Company and the Trustee with the consent
of the Holders of not less than a majority of the aggregate principal amount of
all MAPS at the time outstanding and affected thereby.  The Indenture also
contains provisions permitting the Holders of not less than a majority of the
aggregate principal amount of the MAPS at the time outstanding, on behalf of
the Holders of all MAPS, to waive compliance by the Company with certain
provisions of the Indenture and certain past defaults under the Indenture and
their consequences.  Any such consent or waiver by the Holder of this MAPS
shall be conclusive and binding upon such Holder and upon all future Holders of
this MAPS and other MAPS issued upon the registration or transfer hereof or in
exchange heretofore or in lieu hereof, whether or not notation of such consent
or waiver is made upon this MAPS.

         8.      Obligation to Pay Principal, Premium, If Any, and Interest.
No reference herein to the Indenture and no provision of this MAPS or of the
Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay principal, premium, if any, and interest in
respect of this MAPS at the times, places and rate or formula herein
prescribed.

         9.      Transfer and Exchange.  As provided in the Indenture and
subject to certain limitations therein and herein set forth, the transfer of
this MAPS is registrable in the Security Register of the Company upon surrender
of this MAPS for registration of transfer at the office or agency of the
Company in any place where the principal hereof and any premium or interest
hereon are payable, duly endorsed by, or accompanied by a written instrument of
transfer in form satisfactory to the Company and the Security Registrar duly
executed by, the Holder hereof or by his attorney duly authorized in writing,
and thereupon one or more new MAPS, of authorized denominations and for the
same aggregate principal amount, will be issued to the designated transferee or
transferees.

         As provided in the Indenture and subject to certain limitations
therein and herein set forth, this MAPS is exchangeable for a like aggregate
principal amount of MAPS of different authorized denominations but otherwise
having the same terms and conditions, as requested by the Holder hereof
surrendering the same.

         No service charge shall be made for any such registration of transfer
or exchange, but the Company may require payment of a sum sufficient to cover
any tax or other governmental charge payable in connection therewith as
provided in the Indenture.

         Prior to due presentment of this MAPS for registration of transfer,
the Company, the Trustee and any agent of the Company or the Trustee may treat
the Holder in whose name this MAPS is registered as the owner thereof for all
purposes, whether or not this MAPS be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

         10.     Trustee Dealings with Company.  The Trustee, in its individual
or any other capacity, may make loans to, accept deposits from, and perform
services for the Company or its Affiliates, and may otherwise deal with the
Company or its Affiliates, as if it were not Trustee.

         11.     No Recourse against Others.  A director, officer, employee or
stockholder, as such, of the Company shall not have any liability for any
obligations of the Company under the MAPS or the Indenture or for any claim
based on, in respect of or by reason of such obligations or their creation.
Each Holder by accepting the MAPS waives and releases all such liability.  The
waiver and release are part of the consideration for the issuance of the MAPS.

         12.     Abbreviations.  Customary abbreviations may be used in the
name of a Holder or an assignee, such as TEN COM (=tenants in common), TEN ENT
(=tenants by the entireties), JT TEN (=joint tenants with right of





                                       9
<PAGE>   11
survivorship and not as tenants in common), CUST (=Custodian), and U/G/M/A
(=Uniform Gifts to Minors Act).

         13.     Governing Law.  The Indenture and this MAPS shall be governed
by and construed in accordance with the laws of the State of New York.

         The Company will furnish to any Holder upon written request and
without charge a copy of the Indenture.  Request may be made to:

                 Union Texas Petroleum Holdings, Inc.
                 1330 Post Oak Boulevard
                 Houston, Texas 77056
                 Attention: General Counsel





                                       10
<PAGE>   12
                                ASSIGNMENT FORM

                   FOR VALUE RECEIVED, the undersigned hereby
                       sells, assigns and transfers unto

PLEASE INSERT SOCIAL
SECURITY OR OTHER IDENTIFYING
NUMBER OF ASSIGNEE

- ----------------------------------------------------------------------------
(Please Print or Typewrite Name and Address, including Zip Code, of Assignee)

the within MAPS of Union Texas Petroleum Holdings, Inc., and the undersigned
hereby does irrevocably constitute and appoint

_________________________________________ as agent to transfer said MAPS on the
books of the within-named Company with full power of substitution in the
premises.


Dated: 
      --------------

Signature: 
          ----------------------------

NOTICE: The signature to this assignment must correspond with the name as it
appears on the first page of the within MAPS in every particular, without
alteration or enlargement or any change whatever.

Signature Guaranteed: 
                     ---------------------------------

NOTICE: Signature(s) must be guaranteed by an "eligible guarantor institution"
that is a member or participant in a "signature guarantee program" (e.g., the
Securities Transfer Agents Medallion Program, the Stock Exchange Medallion
Program or the New York Stock Exchange, Inc., Medallion Signature Program).





                                       11

<PAGE>   1
 
                                                                     EXHIBIT 5.1
                           OPINION OF KING & SPALDING
                               REGARDING LEGALITY
<PAGE>   2

                                KING & SPALDING
                           1100 Louisiana, Suite 3300
                              Houston, Texas 77002





                                 April 1, 1998


Union Texas Petroleum Holdings, Inc.
1330 Post Oak Boulevard
Houston, Texas 77056

         Re:     Union Texas Petroleum Holdings, Inc.
                 Shelf Registration Statement on Form S-3 (333-31039)

Ladies and Gentlemen:


         We have acted as counsel for Union Texas Petroleum Holdings, Inc., a
Delaware corporation (the "Company"), in connection with the preparation of a
Registration Statement on Form S-3 No. 333-31039 (the "Registration Statement")
filed with the Securities and Exchange Commission under the Securities Act of
1933, as amended (the "Act"), relating to the offering from time to time, as set
forth in the prospectus contained in the Registration Statement of the Company's
securities in an aggregate amount not to exceed $500,000,000 (the "Prospectus")
and as set forth in a supplement to the Prospectus (the "Prospectus
Supplement"), of MAndatory Putable/remarketable Securities (MAPS(SM)) of the
Company, to be issued by the Company.

         In connection with this opinion, we have examined and relied upon such
records, documents, certificates and other instruments as in our judgment are
necessary or appropriate to form the basis for the opinions hereinafter set
forth.  In all such examinations, we have assumed the genuineness of signatures
on original documents and the conformity to such original documents of all
copies submitted to us as certified, conformed or photographic copies, and as
to certificates of public officials, we have assumed the same to have been
properly given and to be accurate.  As to matters of fact material to this
opinion, we have relied upon statements and representations of representatives
of the Company and of public officials.

         This opinion is limited in all respects to the federal laws of the
United States of America, the laws of the States of Texas and New York and the
General Corporation Law of Delaware, and no
<PAGE>   3
Union Texas Petroleum Holdings, Inc.
Page 2



opinion is expressed with respect to the laws of any other jurisdiction or any
effect which such laws may have on the opinions expressed herein.  This opinion
is limited to the matters stated herein, and no opinion is implied or may be
inferred beyond the matters expressly stated herein.

         Based upon the foregoing, and the other limitations and qualifications
set forth herein, we are of the opinion that:

                 (i)      The Company is a validly existing corporation under
         the laws of the State of Delaware; and

                 (ii)     The Indenture has been duly authorized, executed and
         delivered by the Company and assuming due authorization, execution and
         delivery thereof by the Trustee, constitutes a valid and legally
         binding instrument of the Company enforceable against the Company in
         accordance with its terms; and upon the due authorization of the
         issuance of the MAPS and when duly executed by the Company and
         authenticated by the Trustee in accordance with the Indenture and
         delivered to and paid for by the purchasers thereof in accordance with
         the underwriting agreement approved by the Company and as described in
         the Prospectus Supplement, the MAPS will be legally issued and will
         constitute valid and binding obligations of the Company enforceable
         against the Company in accordance with their terms.

         With respect to the opinion set forth in paragraph (i) above
concerning the good standing of the Company, we have relied exclusively upon
certificates of officers of the Company and a certificate of the Secretary of
State of Delaware.

         The opinions set forth above are subject to the qualifications that
(i) enforcement may be subject the effects of bankruptcy, insolvency,
fraudulent conveyance, reorganization, moratorium and other similar laws
relating to or affecting the enforcement of creditors' rights generally and to
general equitable principles and any implied covenant of good faith and fair
dealing (whether considered in a proceeding at law or in equity), (ii) the
remedy of specific performance and injunctive and other forms of equitable
relief may be subject to  equitable defenses and to the discretion of the court
before which any proceeding therefor may be brought and (iii) with respect to
the enforceability of the Indenture, no opinion is expressed with respect to
Section 615 thereof.

         This opinion is given as of the date hereof, and we assume no
obligation to advise you after the date hereof of facts or circumstances that
come to our attention or changes in law that occur which could affect the
opinions contained herein.  This letter is being rendered solely for the
benefit of the Company in connection with the matters addressed herein.  This
opinion may not be furnished to or relied upon by any person or entity for any
purpose without our prior written consent.





<PAGE>   4
Union Texas Petroleum Holdings, Inc.
Page 3



         We hereby consent to the filing of this opinion as an Exhibit to the
Registration Statement and to the reference to us under the captions "Legal
Matters" in the Prospectus that is included in the Registration Statement and
in the Prospectus Supplement.

                                           Very truly yours,


                                           /s/ KING & SPALDING
                                           King & Spalding






<PAGE>   1
 
                                                                    EXHIBIT 12.1
 
                                 COMPUTATION OF
                       RATIO OF EARNINGS TO FIXED CHARGES
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                       YEARS ENDED DECEMBER 31,
                                         ----------------------------------------------------
                                          1993        1994       1995       1996       1997
                                         -------    --------   --------   --------   --------
<S>                                      <C>        <C>        <C>        <C>        <C>
Pretax income..........................  $26,983    $211,983   $253,327   $379,039   $269,302
Fixed charges:
  Interest expense.....................   30,506      28,721     50,379     49,858     46,850
  Preferred stock dividends of a
     subsidiary........................    1,681
  Capitalized debt cost................    1,536       1,452      1,486      1,332      1,226
  Interest portion of rent expense.....    2,777       3,170      3,126      2,928      3,270
                                         -------    --------   --------   --------   --------
          Total fixed charges..........   36,500      33,343     54,991     54,118     51,346
Less: Capitalized interest, net........    4,623       1,464      4,845      8,690     27,270
                                         -------    --------   --------   --------   --------
                                          31,877      31,879     50,146     45,428     24,076
Earnings before fixed charges..........  $58,860    $243,862   $303,473   $424,467   $293,378
                                         =======    ========   ========   ========   ========
Ratio of earnings to fixed charges.....     1.61(1)     7.31       5.52       7.84       5.71(2)
</TABLE>
 
- ---------------
 
(1) During 1993, the Company recorded a non-cash charge to depreciation,
    depletion and amortization of $103 million pretax ($48 million after-tax)
    for the write-down of its investment in the U.K. North Sea's Piper field.
    Excluding the effect of the piper write-down, the ratio of earnings to fixed
    charges for 1993 would have been 4.45.
 
(2) The 1997 pro forma ratio of earnings to fixed charges would be 4.99 as
    calculated below:
 
<TABLE>
    <S>                                                           <C>
    1997 fixed charges per above................................  $51,346
      Pro forma adjustments
         Bond interest requirements.............................   10,650
         Estimated decrease in interest expense due to
          refinancing...........................................   (3,200)
                                                                  -------
      Total pro forma fixed charges.............................  $58,796
                                                                  =======
      Pro forma ratio of earnings to fixed charges..............     4.99
                                                                  =======
</TABLE>
 
      The pro forma adjustments give effect to the issuance of bonds at an
      assumed annual interest rate of 7.10% and the application of a portion of
      the proceeds to the reduction of debt under the uncommitted and unsecured
      lines of credit, as if such transaction had taken place January 1, 1997.
<PAGE>   2
 
                                 COMPUTATION OF
                  RATIO OF EARNINGS TO COMBINED FIXED CHARGES
                         AND PREFERRED STOCK DIVIDENDS
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                         YEARS ENDED DECEMBER 31,
                                           ----------------------------------------------------
                                            1993        1994       1995       1996       1997
                                           -------    --------   --------   --------   --------
<S>                                        <C>        <C>        <C>        <C>        <C>
Pretax income............................  $26,983    $211,983   $253,327   $379,039   $269,302
Fixed charges
  Interest expense.......................   30,506      28,721     50,379     49,858     46,850
  Preferred stock dividends of
     subsidiary..........................    1,681
  Capitalized debt cost..................    1,536       1,452      1,486      1,332      1,226
  Interest portion of rent expense.......    2,777       3,170      3,126      2,928      3,270
                                           -------    --------   --------   --------   --------
          Total fixed charges............   36,500      33,343     54,991     54,118     51,346
  Less: Capitalized interest, net........    4,623       1,464      4,845      8,690     27,270
                                           -------    --------   --------   --------   --------
                                            31,877      31,879     50,146     45,428     24,076
Earnings before fixed charges............  $58,860    $243,862   $303,473   $424,467   $293,378
                                           =======    ========   ========   ========   ========
Ratio of earnings to fixed charges.......     1.61(1)     7.31       5.52       7.84       5.71(2)
</TABLE>
 
- ---------------
 
(1) During 1993, the Company recorded a non-cash charge to depreciation,
    depletion and amortization of $103 million pretax ($48 million after-tax)
    for the write-down of its investment in the U.K. North Sea's Piper Field.
    Excluding the effect of the piper write-down, the ratio of earnings to fixed
    charges for 1993 would have been 4.45.
 
(2) The 1997 pro form a ratio of earnings to combined fixed charges and
    preferred stock dividends would be 3.50 as calculated below:
 
<TABLE>
    <S>                                                           <C>       <C>
    1997 fixed charges per above................................            $51,346
      Pro forma adjustments
         Preferred stock dividend requirements..................  12,495
         Ratio of 1997 pretax income to net income..............     2.0
                                                                  ------
         Preferred stock dividend factor........................             24,990
         Bond interest requirements.............................             10,650
         Estimated decrease in interest expense due to
          refinancing...........................................             (3,200)
                                                                            -------
      Total pro forma combined fixed charges and preferred stock
         dividends..............................................            $83,786
                                                                            =======
      Pro forma ratio of earnings to combined fixed charges and
         preferred stock dividends..............................               3.50
                                                                            =======
</TABLE>
 
     The pro forma adjustments give effect to preferred stock dividends as a
     result of the issuance of $175 million of the preferred stock at an annual
     dividend rate of 7.14% and the issuance of bonds at an assumed annual
     interest rate of 7.10% and the application of a portion of the proceeds to
     the reduction of debt under the revolving credit facility and the
     uncommitted and unsecured lines of credit, as if such transactions had
     taken place January 1, 1997.


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