TWEEDY BROWNE CO L P
SC 13D/A, 1996-10-08
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D
                               (Amendment No. 8)*
                                       of
                           Tweedy, Browne Company L.P.


                                  SCHEDULE 13D
                               (Amendment No. 8)*
                                       of
                               TBK Partners, L.P.


                                  SCHEDULE 13D
                               (Amendment No. 8)*
                                       of
                            Vanderbilt Partners, L.P.



                    Under the Securities Exchange Act of 1934

                             GRANT GEOPHYSICAL, INC.
                                (Name of Issuer)


       Convertible Exchangeble Preferred Stock, Par Value $0.01 per Share
                         (Title of Class of Securities)

                                    388218208
                                 (CUSIP Number)



                                 John D. Spears
                              52 Vanderbilt Avenue
                            New York, New York 10017
                                 (212) 916-0600
                 (Name, Address and Telephone Number of Persons
                Authorized to Receive Notices and Communications)



                               September 26, 1996
             (Date of Event which Required Filing of this Statement)
<PAGE>   2
If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is paid with the statement [ ]. (A fee is not
required only if the reporting person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act,
but shall be subject to all the provisions of the Act (however, see the Notes).
<PAGE>   3
                                  SCHEDULE 13D

CUSIP No. 388218208                                          Page 3 of 11 Pages

- --------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Tweedy, Browne Company L.P. ("TBC")
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                      (a)/ /
                                                                         (b)/X/


- --------------------------------------------------------------------------------
3  SEC USE ONLY

- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*

        00
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
   2(d) or 2(E)                                                             / /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                7  SOLE VOTING POWER

                   TBC has sole voting power with respect to 51,050 shares held
                   in certain TBC accounts (as hereinafter defined). 
                   Additionally, certain of the general partners of TBC may be
 NUMBER OF         be deemed to have sole power to vote certain shares as more
  SHARES           fully set forth herein.
BENEFICIALLY   -----------------------------------------------------------------
 OWNED BY       8  SHARED VOTING POWER
   EACH
 REPORTING         0 shares
  PERSON       -----------------------------------------------------------------
   WITH         9  SOLE DISPOSITIVE POWER

                   0 shares, except that certain of the general partners of TBC
                   may be deemed to have sole power to dispose of certain shares
                   as more fully set forth herein.
               -----------------------------------------------------------------
               10  SHARED DISPOSITIVE POWER

                   51,050 shares held in accounts of TBC (as hereinafter 
                   defined)
- --------------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        51,050 shares
- --------------------------------------------------------------------------------
12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*    /X/
                                                                                
- --------------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

        2.37%
- --------------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON*

        BD & IA
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>   4
                                  SCHEDULE 13D

CUSIP No. 388218208                                         Page 4  of  11 Pages

- --------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        TBK Partners, L.P. ("TBK")         
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                      (a)/ /
                                                                         (b)/X/


- --------------------------------------------------------------------------------
3  SEC USE ONLY

- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*

        WC and BK
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
   2(d) or 2(E)                                                             / /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                7  SOLE VOTING POWER

                   0 shares, except that the general partners in TBK,
 NUMBER OF         solely by reason of their positions as such, may be deemed
  SHARES           to have shared power to vote these shares.
BENEFICIALLY   -----------------------------------------------------------------
 OWNED BY       8  SHARED VOTING POWER
   EACH
 REPORTING         0 shares
  PERSON       -----------------------------------------------------------------
   WITH         9  SOLE DISPOSITIVE POWER

                   0 shares, except that the general partners in
                   TBK, solely by reason of their positions as such,
                   may be deemed to have shared power to vote these shares.
               -----------------------------------------------------------------
               10  SHARED DISPOSITIVE POWER

                   0 shares
- --------------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        0 shares
- --------------------------------------------------------------------------------
12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*    /X/
                                                                                
- --------------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

        0%
- --------------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON*

        PN
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   5
                                  SCHEDULE 13D

CUSIP No. 388218208                                           Page 5 of 11 Pages

- --------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Vanderbilt Partners, L.P. ("Vanderbilt")
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                      (a)/ /
                                                                         (b)/X/


- --------------------------------------------------------------------------------
3  SEC USE ONLY

- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*

        WC and BK
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
   2(d) or 2(E)                                                             / /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                7  SOLE VOTING POWER

                   0 shares, except that the general partners in Vanderbilt,    
                   solely by reason of their positions as such, may be
                   deemed to have shared power to vote these shares.          
 NUMBER OF                                                                  
  SHARES                                     
BENEFICIALLY   -----------------------------------------------------------------
 OWNED BY       8  SHARED VOTING POWER
   EACH 
 REPORTING              0 shares
  PERSON       -----------------------------------------------------------------
   WITH        9  SOLE DISPOSITIVE POWER

                        0 shares, except that the general partners of 
                        Vanderbilt, solely by reason of their positions as such,
                        may be deemed to have shared power to vote these shares.
               -----------------------------------------------------------------
               10  SHARED DISPOSITIVE POWER

                        0 shares
- --------------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              0 shares
- --------------------------------------------------------------------------------
12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*    /X/
                                                                                
- --------------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

        0%
- --------------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON*

        PN
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>   6
PRELIMINARY NOTE

      This Amendment No. 8 is being filed because the filing persons are no
longer subject to the reporting requirements of Section 13(d) of the Securities
Exchange Act of 1934, as a result of the disposition of shares of Convertible
Exchangeable Preferred Stock ("Preferred Stock"), in open market transactions.
This Amendment No. 8 is being filed by Tweedy, Browne Company L.P. ("TBC"), TBK
Partners, L.P. ("TBK") and Vanderbilt Partners, L.P. ("Vanderbilt") who may be
deemed to be members of a group. However, the filing of this Amendment No. 8
should not be deemed an admission that TBC, TBK and Vanderbilt comprise a group
within the meaning of Section 13(d)(3) of the Securities and Exchange Act of
1934, as amended (the "Act").

      Pursuant to Rule 13d-2(a) of Regulation 13D-G of the General Rules and
Regulations, each of TBC, TBK and Vanderbilt hereby amend their respective
Statements on Schedule 13D, relating to the Preferred Stock of Grant
Geophysical, Inc. TBC, TBK and Vanderbilt filed a Statement on Schedule 13D,
dated as of March 29, 1993 (the "Statement"). Pursuant to Item 101(a)(2)(ii) of
Regulation S-T, this Amendment No. 8 also includes an amended and restated
composite of all paper filings to date made by TBC, TBK and Vanderbilt,
respectively, on Schedule 13D with respect to Grant Geophysical, Inc.


ITEM 1.  SECURITY AND ISSUER

      This Schedule 13D relates to the Preferred Stock, $.01 par value of Grant
Geophysical, Inc. (the "Company"), which, to the best knowledge of the persons
filing this Schedule 13D, is a company organized under the laws of Delaware,
with its principal executive offices located at 10615 Shadow Wood Drive,
Houston, Texas 77043.

ITEM 2. IDENTITY AND BACKGROUND

      (a) The persons filing this Schedule 13D are (i) Tweedy, Browne Company
L.P. ("TBC"), a Delaware limited partnership, (ii) TBK Partners, L.P. ("TBK"), a
Delaware limited partnership and (iii) Vanderbilt Partners, L.P. ("Vanderbilt"),
a Delaware limited partnership. Annexed as Exhibit 99.1, which is incorporated
by reference herein, is an agreement among TBC, TBK and Vanderbilt that this
Schedule 13D is filed on behalf of each of them. The filing of this Schedule 13D
should not be deemed an admission that TBC, TBK and Vanderbilt comprise a group
within the meaning of Section 13(d)(3) of the Securities Exchange Act of 1934
(the "Act").

      This Schedule 13D contains information regarding shares of Preferred Stock
that may be deemed to be beneficially owned by TBC. Such shares are held in the
accounts of various customers of TBC, with respect to which accounts TBC has
investment discretion (the "TBC Accounts"), and with respect to some of which it
has obtained sole or shared voting power.

      This Schedule 13D also contains information regarding shares of Preferred
Stock that are held in a TBC account for the Tweedy, Browne Company L.P. Profit
Sharing Plan (the "TBC Plan"), of which Christopher H. Browne and John D. Spears
are the sole trustees (see Item 5 hereof). Messrs. Browne and Spears are two of
the general partners in TBC, TBK and Vanderbilt.

      The general partners of TBK are Christopher H. Browne, William H. Browne,
Thomas P. Knapp and John D. Spears. The general partners of TBC and Vanderbilt
are Christopher H. Browne, William H. Browne and John D. Spears (the "General
Partners"). By reason of their positions as such, the general partners of TBK
may be deemed to control TBK and the general partners of TBC and Vanderbilt may
be deemed to control TBC and Vanderbilt, respectively.

<PAGE>   7
      (b) The business address of each of TBC, TBK, Vanderbilt, the General
Partners and Thomas P. Knapp is 52 Vanderbilt Avenue, New York, New York 10017.

      (c) TBC is engaged primarily in the business of a securities broker and
dealer and investment adviser, is registered as a broker-dealer and investment
adviser with the Securities and Exchange Commission, and is a member of the
National Association of Securities Dealers, Inc.

      TBK is a private investment partnership and is currently, and at all
relevant times was, engaged primarily in the business of investing in securities
for its own account.

      Vanderbilt is a private investment partnership and is currently, and at
all relevant times was, engaged primarily in the business of investing in
securities for its own account.

      The present principal occupation of each of the General Partners is
serving as such for TBC, TBK and Vanderbilt. The present principal occupation of
Thomas P. Knapp is serving as a general partner in TBK. The principal business
address of each of TBC, TBK and Vanderbilt is set forth above.

      (d) None of TBC, TBK, Vanderbilt, Thomas P. Knapp, nor any General Partner
has, during the last five years, been convicted in any criminal proceeding
(excluding traffic violations and similar misdemeanors).

      (e) None of TBC, TBK, Vanderbilt, Thomas P. Knapp, nor any General Partner
has, during the last five years, been a party to a civil proceeding of a
judicial or administrative body of competent jurisdiction as a result of which
proceeding it or he was or is subject to a judgment, decree or final order
enjoining future violations of, or prohibiting or mandating activities subject
to, federal or state securities laws or finding any violations with respect
thereto.

      (f) Each of TBC, TBK and Vanderbilt is a Delaware limited partnership.
Each of the General Partners and Thomas P. Knapp is a citizen of the United
States of America.


ITEM 3.  SOURCE AND AMOUNTS OF FUNDS OR OTHER CONSIDERATION


      As of the date hereof, the number of shares with respect to which TBC may
be deemed to be the beneficial owner is 51,050 shares of Preferred Stock (the
"TBC Shares"), all of which shares were purchased in open market transactions.
The aggregate cost of the TBC Shares, including brokerage commissions, was 
$948,658.

      The TBC Shares are held in the TBC Accounts, the funds therefor coming
from the funds on hand in each individual managed account and in certain
instances from standard margin account borrowings from brokerage accounts
maintained at Fleet Clearing Corporation. It is expected that funds used by the
TBC Accounts to purchase additional shares of Preferred Stock, if additional
shares are purchased by the TBC Accounts (see Item 4 hereof), will come from the
funds on hand for each individual managed account, which funds on hand at any
time and from time to time may include, among others, funds borrowed pursuant to
margin accounts maintained at Fleet Clearing Corporation. Borrowings made by
certain TBC Accounts pursuant to such margin accounts are secured by margin
securities owned by the respective accounts, including some of the TBC Shares.
Interest on outstanding borrowings under such margin accounts ranges from 1/2%
to 2% over the brokers' call rate in effect from time to time at Chemical Bank,
New York, New York, depending upon the amount of outstanding borrowings at any
given time.


<PAGE>   8
      As a result of the disposition of 10,000 shares of Preferred Stock in open
market transactions TBK, does not beneficially own directly any shares of
Preferred Stock (the "TBK Shares"). (TBK and certain of the general partners in
TBK, who are also general partners of TBC and Vanderbilt may also be deemed to
be the indirect beneficial owners of certain other shares of Preferred Stock, as
set forth in Item 5 hereof.)

      It is expected that funds used by TBK to purchase additional shares of
Preferred Stock, if additional shares are purchased by TBK (see Item 4 hereof),
will come from TBK's general funds, which include cash and cash equivalents on
hand and in banks.

      TBK's general funds have included, and it is expected that they will from
time to time include, funds borrowed by it pursuant to an understanding with
Chemical Bank. As of the date hereof, TBK has a loan outstanding with Chemical
Bank in the amount of $20,000.00. Borrowings made by TBK pursuant to that
understanding bear interest at the brokers' call rate in effect from time to
time at Chemical Bank. TBK's funds on hand have also included, and it is
expected that they will from time to time include, funds borrowed by it pursuant
to an understanding with The Bank of New York, New York, New York. Pursuant to
that understanding, TBK may borrow funds at the brokers' call rate charged from
time to time by The Bank of New York. As of the date hereof, TBK has a loan
outstanding with The Bank of New York in the amount of $10,000.00. Borrowings
made by TBK pursuant to its understandings with Chemical Bank and The Bank of
New York are secured by securities owned by TBK; such borrowings are not secured
by any TBK Shares. No borrowings from Chemical Bank or The Bank of New York were
made for the purpose of acquiring the TBK Shares. TBK reserves the right to
include all or any of the shares of Preferred Stock owned by it at any time or
from time to time, among the securities that serve as collateral for such
borrowings, subject to compliance with any applicable statutes and regulations.

      As a result of the disposition of 3,700 shares of Preferred Stock in open
market transactions , Vanderbilt does not beneficially own directly any shares
of Preferred Stock (the "Vanderbilt Shares"). (Vanderbilt and certain of the
general partners in Vanderbilt, who are also general partners in TBC and TBK may
also be deemed to be the indirect beneficial owners of certain other shares of
Preferred Stock, as set forth in Item 5 hereof.)

      It is expected that funds used by Vanderbilt to purchase additional shares
of Preferred Stock, if additional shares are purchased by Vanderbilt (see Item 4
hereof), will come from Vanderbilt's general funds, which include cash and cash
equivalents on hand and in banks.

      Vanderbilt's general funds have included, and it is expected that they
will from time to time include, funds borrowed by it pursuant to an
understanding with Chemical Bank. No borrowings from Chemical Bank were made by
Vanderbilt for the purpose of acquiring the Vanderbilt Shares. Vanderbilt
reserves the right to include all or any of the shares of Preferred Stock owned
by it at any time or from time to time, among the securities that serve as
collateral for such borrowings, subject to compliance with any applicable
statutes and regulations.

ITEM 4.  PURPOSE OF TRANSACTION

      Each of TBC, TBK and Vanderbilt has acquired the shares of Preferred Stock
owned by it for investment purposes and for none of the reasons enumerated in
Item 4 of Schedule 13D, except that TBC, TBK and Vanderbilt may dispose of all
or some of the TBC Shares, the TBK Shares and the Vanderbilt Shares,
respectively, or may acquire additional shares of Preferred Stock from time to
time, depending upon price and market conditions, evaluation of alternative
investments, and other factors.




<PAGE>   9

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

      (a) As of the date hereof, TBC may be deemed to be the beneficial owner of
an aggregate of 51,050 shares of Preferred Stock, which constitutes
approximately 2.37 % of the 2,157,000 shares of Preferred Stock which TBC
believes to be the total number of shares of Preferred Stock outstanding. The
TBC Shares are held in the TBC Accounts.

      As a result of the disposition of 10,000 shares of Preferred Stock in open
market transactions, as of the date hereof, TBK does not beneficially own
directly any shares of Preferred Stock.

      As a result of the disposition of 3,700 shares of Preferred Stock in open
market transactions, as of the date hereof, Vanderbilt does not beneficially own
directly any shares of Preferred Stock.

      Each of TBC, TBK and Vanderbilt disclaims that it is the beneficial owner
of any of the shares of Preferred Stock held in the TBC Accounts. The aggregate
number of shares of Preferred Stock with respect to which TBC, TBK and
Vanderbilt could be deemed to be the beneficial owner as of the date hereof, is
51,050 shares, which constitutes approximately 2.37% of the 2,157,000 shares of
Preferred Stock, which the filing persons believe to be the total number of
shares of Preferred Stock outstanding, but nothing contained herein shall be
construed as an admission that TBC is the beneficial owner of any of the TBC
Shares.

      Additionally, 4,000 shares of Preferred Stock are held in a TBC account
for the TBC Plan. The TBC plan is an employee benefit plan of which Christopher
H. Browne and John D. Spears are the sole trustees. Messrs. Browne and Spears
are two of the general partners in TBC, TBK and Vanderbilt.

      The aggregate number of shares and percentage of Preferred Stock with
respect to which each of the General Partners may be deemed to be the beneficial
owner by reason of his being a general partner of TBC, TBK and Vanderbilt,
respectively, is 51,050 shares, which constitutes approximately 2.37% of the
2,157,000 shares of Preferred Stock outstanding. As of the date hereof, Thomas
P. Knapp does not beneficially own any shares of Preferred Stock. However,
nothing contained herein shall be construed as an admission that any of the
General Partners or Thomas P. Knapp is the beneficial owner of any shares of
Preferred Stock, except as set forth herein as expressly and admittedly being
beneficially owned by a particular General Partner or Thomas P. Knapp.

      Each of TBC, TBK and Vanderbilt disclaims beneficial ownership of
Preferred Stock held by the other. Except as described herein, to the best
knowledge of TBC, TBK and Vanderbilt, no person who may be deemed to comprise a
group with any of TBC, TBK, Vanderbilt, or any other person named in Item 2
hereof, beneficially owns any shares of Preferred Stock.

      (b) TBC has investment discretion with respect to 51,050 shares of
Preferred Stock held by the TBC Accounts and has sole power to dispose or direct
the disposition of all of such shares. Of these shares of Preferred Stock, TBC
has sole power to vote or to direct the voting of 51,050 shares of Preferred
Stock held in certain TBC Accounts.

      Each of the General Partners of TBC, solely by reason of their positions
as such, may be deemed to have (i) shared power to dispose of or to direct the
disposition of all of the shares of Preferred Stock held in the TBC Accounts;
and (ii) shared power to vote or direct the vote of 51,050 shares of Preferred
Stock held in certain TBC Accounts.

<PAGE>   10
      TBK has the sole power to vote or direct the voting of and dispose or
direct the disposition of the TBK Shares. Each of the General Partners and
Thomas P. Knapp, solely by reason of their positions as general partners, may be
deemed to have shared power to vote or direct the vote of and to dispose or
direct the disposition of the TBK Shares.

      Vanderbilt has the sole power to vote or direct the voting of and dispose
or direct the disposition of the Vanderbilt Shares. Each of the General Partners
of Vanderbilt, solely by reason of their positions as such, may be deemed to
have shared power to vote or direct the vote of and to dispose or direct the
disposition of the Vanderbilt Shares.

      Christopher H. Browne and John D. Spears, as sole trustees of the TBC
Plan, may be deemed to have sole power to direct the voting and sole power to
dispose of the 4,000 shares of Preferred Stock held by the TBC Plan. TBC does
not have investment discretion with respect to, or the power to vote, the 4,000
shares of Preferred Stock held by the TBC Plan..

      (c) During the sixty day period ended as of the date hereof, TBC , TBK and
Vanderbilt has sold shares of the Preferred Stock in open market transactions,
as follows:

<TABLE>
<CAPTION>
REPORTING                                NO. OF           PRICE
PERSON                    DATE         SHARES SOLD      PER SHARE

<S>                     <C>              <C>             <C>     
TBC Accounts            09/23/96         140,000         $ 18.375
                        09/25/96          20,000         $18 7/16
                        09/26/96           1,000         $ 18 3/4

TBK:                    09/23/96          10,000         $ 18.375

Vanderbilt:             09/23/96           3,700         $ 18.375
</TABLE>

      (d) To the best knowledge of TBC, each of the persons maintaining an
account with TBC has the right to receive or the power to direct the receipt of
dividends from, or the proceeds from the sale of, the shares of Preferred Stock
held in said person's TBC Account.

      To the best knowledge of TBK, no person other than TBK has the right to
receive or the power to direct the receipt of dividends from, or the proceeds
from the sale of, the TBK Shares, except that the General Partners and Thomas P.
Knapp may be deemed to have such rights and powers solely by reason of being
general partners in TBK.

      To the best knowledge of Vanderbilt, no person other than Vanderbilt has
the right to receive or the power to direct the receipt of dividends from, or
the proceeds from the sale of, the Vanderbilt Shares, except that the General
Partners in Vanderbilt may be deemed to have such rights and powers solely by
reason of being general partners in Vanderbilt.

      (e) TBC, TBK and Vanderbilt ceased to be the beneficial owner of 5% of
Preferred Stock on September 26, 1996.





<PAGE>   11
ITEM 6.     CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
            RESPECT TO SECURITIES OF THE ISSUER.

      Except as otherwise described herein, none of TBC, TBK or Vanderbilt, nor,
to the best knowledge of TBC, TBK or Vanderbilt, any other person named in Item
2 hereof, has any contract, arrangement, understanding or relationship with
respect to any securities of the Issuer.

ITEM 7.     MATERIAL TO BE FILED AS EXHIBITS

      Exhibit 99.1 - - Agreement pursuant to Rule 13d-1(f)(1)(iii).
<PAGE>   12

                                    SIGNATURE


      Each of Tweedy, Browne Company L.P., TBK Partners, L.P. and Vanderbilt
Partners, L.P., after reasonable inquiry and to the best of its knowledge and
belief, hereby certifies that the information set forth in this Statement (which
includes the Exhibit annexed hereto) is true, complete and correct.

                                          TWEEDY, BROWNE COMPANY L.P.



                                          By__________________________
                                             Christopher H. Browne
                                             General Partner



                                          TBK PARTNERS, L.P.



                                          By__________________________
                                             Christopher H. Browne
                                             General Partner




                                          VANDERBILT PARTNERS, L.P.



                                          By__________________________
                                             Christopher H. Browne
                                             General Partner











Dated: October 2, 1996

<PAGE>   1
                                  EXHIBIT 99.1


      AGREEMENT dated as of October 2, 1996 among Tweedy, Browne Company L.P., a
Delaware limited partnership ("TBC"), TBK Partners, L.P., a Delaware limited
partnership ("TBK"), and Vanderbilt Partners L.P., a Delaware limited
partnership ("Vanderbilt").


                                   WITNESSETH:

      WHEREAS, TBC, TBK and Vanderbilt may be deemed to have acquired, in the
aggregate, beneficial ownership of more than five percent of the Convertible
Exchangeable Preferred Stock ("Preferred Stock") of Grant Geophysical, Inc. (The
"Company") and

      WHEREAS, pursuant to Rule 13d-1 under the Securities Exchange Act of 1934
(the "Act"), a Statement on Schedule 13D must be filed by any person who
acquires more than five percent of registered equity securities; and

      WHEREAS, in accordance with Rule 13d-1(f) of the Act, only one such
Statement need be filed whenever two or more persons are required to file such a
Statement pursuant to Section 13(d) of the Act with respect to the same
securities, provided that said persons agree in writing that such Statement is
filed on behalf of each of them.

      NOW, THEREFORE, in consideration of the premises and mutual agreements
herein contained, the parties hereto agree as follows:

      TBC, TBK and Vanderbilt do hereby agree, in accordance with Rule 13d-1(f)
under the Act, to file one Statement on Schedule 13D relating to their ownership
of the Preferred Stock, and do hereby further agree that said Statement shall be
filed on behalf of each of TBC, TBK and Vanderbilt. Nothing herein, however,
shall be, or shall be deemed to be, an admission that the parties hereto, or any
of them, are members of a "group" (within the meaning of Section 13(d) of the
Act and the rules and regulations promulgated thereunder) with respect to any
securities of the Company.

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


TWEEDY, BROWNE COMPANY L.P.                       VANDERBILT PARTNERS, L.P.



By_____________________________                   By______________________
   Christopher H. Browne                            Christopher H. Browne
   General Partner                                  General Partner


TBK PARTNERS, L.P.



By_____________________________
   Christopher H. Browne
   General Partner


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