Document:

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                                                                     EXHIBIT 4.3

                          BARRETT RESOURCES CORPORATION

                                  $150,000,000

                           7.55% SENIOR NOTES DUE 2007

                          FIRST SUPPLEMENTAL INDENTURE

                         BARRETT RESOURCES CORPORATION,

                                   as Issuer,

                                       and

                             BANKERS TRUST COMPANY,

                                   as Trustee

                                   Dated as of

                          _______________________, 2001

<PAGE>

                          FIRST SUPPLEMENTAL INDENTURE

         FIRST SUPPLEMENTAL INDENTURE (this "Supplemental Indenture") dated as
of __________________, 2001, between Barrett Resources Corporation, a
corporation duly organized and existing under the laws of the State of Delaware
(hereinafter called the "Company"), and Bankers Trust Company, a banking
corporation existing under the laws of the State of New York, as trustee (the
"Trustee");

         WHEREAS, the Company and the Trustee have heretofore executed and
delivered an indenture dated as of February 1, 1997 (hereinafter called the
"Original Indenture") to provide for the issuance of the Company's 7.55% Senior
Notes due 2007 (the "Notes"); and

         WHEREAS, on May 7, 2001, the Company, The Williams Companies, Inc., a
Delaware corporation ("Williams"), and Resources Acquisition Corp., a Delaware
corporation and a wholly-owned subsidiary of Williams (the "Acquisition Sub"),
entered into an Agreement and Plan of Merger (the "Merger Agreement") pursuant
to which, subject to the satisfaction of the conditions set forth in the Merger
Agreement, either the Company will be merged with and into the Acquisition Sub
(the "Forward Merger") or the Acquisition Sub (or another direct or indirect.,
wholly-owned subsidiary of Williams) will be merged with and into the Company
(the "Reverse Merger"') (the Forward Merger and the Reverse Merger,
collectively, the "Merger"; and

         WHEREAS, in the event of the Forward Merger, pursuant to Section 5.02
of the Original Indenture, subject to satisfaction of the conditions set forth
in Section 5.01 of the Original Indenture, the Acquisition Sub will assume all
the obligations of the Company under the Original Indenture and the Notes or, in
the event of the Reverse Merger, the obligations of the Company under the
Indenture and the Notes will continue; and

         WHEREAS, it is intended by the Company that the Amendments (as defined
below) effected pursuant to the Consent Solicitation Statement (as defined
below) and this Supplemental Indenture shall be treated as an integrated
transaction with the Forward Merger and as a part of such "reorganization"
within the meaning of Section 368(a) of the Internal Revenue Code of 1986, as
amended; and

         WHEREAS, Section 9.02 of the Original Indenture provides, among other
things, that, with the consent of the Holders of at least a majority in
aggregate principal amount of the Notes then outstanding, the Company and the
Trustee may enter into indentures supplemental to the Original Indenture for the
purpose of amending any provision of the Original Indenture or the Notes (other
than as provided in Section 9.02 of the Original indenture); and

         WHEREAS, the Company desires (i) to conform certain provisions of the
Original Indenture to the Senior Indenture, dated as of November 10, 1997, as
amended to the date hereof, between Williams, as Issuer, and Bank One Trust
Company, NA. (formerly The First National Bank of Chicago), as trustee (the
"Williams Indenture"), by (a) modifying the covenant dealing with restrictions
on liens and related provisions of the Original Indenture arid (b) eliminating
the cross-default and judgment default provisions of the Original Indenture and
(ii) to amend the

<PAGE>

reporting covenant contained in the Original Indenture to require Williams
instead of the Company to provide to the Securities and Exchange Commission or
to the Trustee periodic business and financial information specified by Section
13 or Section 15(d) of the Securities and Exchange Act of 1934, as amended (the
"Exchange Act"), including Annual Reports on Form 10-K; and

         WHEREAS, all action on the part of the Company necessary to authorize
its execution, delivery and performance of the Original Indenture, as further
supplemented by this First Supplemental Indenture, has been duly taken; and

         WHEREAS. Williams has solicited the consent of the Holders of the Notes
to certain amendments to the Original Indenture (the "Amendments") pursuant to
that certain Consent Solicitation Statement dated July 18, 2001 (the "Consent
Solicitation Statement"); and

         WHEREAS, Holders of at least a majority in aggregate principal amount
of the Notes have consented to the Amendments and instruments evidencing such
consent have been delivered to the Trustee; and

         WHEREAS, the Company desires and has requested the Trustee to join in
the execution and delivery of this Supplemental Indenture for the purpose of
amending the Original Indenture;

         NOW THEREFORE, in consideration of the premises and for other good and
valuable consideration, it is mutually covenanted and agreed for the equal and
ratable benefit of all Holders of the Notes as follows, effective upon execution
hereof by the Trustee:

                                   DEFINITION

         Section 1.1 Definition. When used herein, "Consent Solicitation
Completion Event" shall mean such time as each of the following events shall
have occurred: (i) the Merger shall have been consummated in accordance with the
terms and conditions set forth in the Merger Agreement and (ii) each Holder of
Notes that has validly consented to the Amendments pursuant to the Consent
Solicitation Statement shall have received payment for its consent in accordance
with the Consent Solicitation Statement.

                                   ARTICLE TWO

                        AMENDMENTS TO ORIGINAL INDENTURE

         Section 2.1 Amended Definitions. Upon the occurrence of the Consent
Solicitation Completion Event, Section 1.01 of the Original Indenture shall be
amended as follows:

                  (a) the definition of each term that is used in the Original
Indenture only in the Sections or subsections thereof that are deleted pursuant
to Section 2.2. hereof shall be deleted;

                  (b) the following definitions shall be added:

<PAGE>

                           "Consolidated Funded Indebtedness" means the
aggregate of all outstanding Funded Indebtedness of the Company and its
Restricted Subsidiaries, determined on a consolidated basis in accordance with
GAAP;

                           "Williams" means The Williams Companies, Inc., a
Delaware corporation, and any successor corporations thereto; and

                  (c) the definitions of "Consolidated Net Tangible Assets" and
"Funded Indebtedness" shall be replaced with the following definitions:

                           "Consolidated Net Tangible Assets" means the total
assets appearing on a consolidated balance sheet of the Company and its
Restricted Subsidiaries on a consolidated basis, less:

                           (1) intangible assets, unamortized debt discount and
expense and stock expense and other deferred debits;

                           (2) all current and accrued liabilities (other than
Consolidated Funded Indebtedness and capitalized rentals or leases); deferred
credits (other than deferred investment tax credits), deferred gains and
deferred income and billings recorded as revenues deferred pending the outcome
of a rate proceeding (less applicable income taxes) to the extent refunds
thereof shall not have been finally determined;

                           (3) all reserves (other than for deferred Federal
income taxes arising from timing differences) not already deducted from assets;

                           (4) all advances made by the Company or its
Restricted Subsidiaries to finance oil or natural gas exploration and
development to the extent that the Indebtedness related thereto and of an equal
amount is excluded from Funded indebtedness by virtue of the proviso to the
definition thereof;

                           (5) an amount equal to the amount excluded from
Funded Indebtedness representing "production payment" financing of oil or
natural gas exploration and development by the Company or its Restricted
Subsidiaries on a consolidated basis; and

                           (6) appropriate allowance for minority stockholder
interests;

                           "Funded Indebtedness" means any Indebtedness which
matures more than one year after the date as of which Funded Indebtedness is
being determined less any such Indebtedness as will be retired through or by
means of any deposit or payment required to be made within one year from such
date under any prepayment provision, sinking fund, purchase fund or otherwise;
provided, however, that such term shall not include Indebtedness of the Company
or any of its Restricted Subsidiaries incurred to finance outstanding advances
to others to finance oil or natural gas exploration and development to the
extent that the latter are not in default in their obligations to the Company or
such Restricted Subsidiary, nor shall such term

<PAGE>

include Indebtedness of the Company or any of its Restricted Subsidiaries
incurred to finance oil or natural gas exploration and development by means
commonly referred to as a "production payment" to the extent that the Company or
any of its Restricted Subsidiaries have not guaranteed the repayment of the
production payment.

         Section 2.2 Amended Provisions. Upon the occurrence of the Consent
Solicitation Completion Event, the text of each of the following Sections or
subsections of the Original Indenture shall be amended as follows:

                  (a) Section 4.03 SEC Reports; Financial Statements. References
to "the Company" in Section 4.03 shall be replaced with references to
"Williams".

                  (b) Section 4.09 Limitation on Liens. Subsections (a) through
(i) of Section 4.09 shall be deleted in their entirety and replaced with the
following subsections (a) through (bb):

                           (a) Any purchase money Lien created by the Company or
         a Restricted Subsidiary to secure all or part of the purchase price of
         any property (or to secure a loan made to enable the Company or a
         Restricted Subsidiary to acquire the property described in such Lien),
         provided that the principal amount of the Indebtedness secured by any
         such Lien, together with all other Indebtedness secured by a Lien on
         such property, shall not exceed the purchase price of the property
         acquired;

                           (b) Any Lien existing on any property at the tune of
         the acquisition thereof by the Company or a Restricted Subsidiary
         whether or not assumed by the Company or a Restricted Subsidiary, and
         any Lien on any property acquired or constructed by the Company or a
         Restricted Subsidiary and created not later than 12 months after (i)
         such acquisition or completion of such construction or (ii)
         commencement of full operation of such property, whichever is later;
         provided, however, that, if assumed or created by the Company or a
         Restricted Subsidiary, the principal amount of the Indebtedness secured
         by such Lien, together with all other Indebtedness secured by a Lien on
         such property, shall not exceed the purchase price of the property,
         acquired and/or the cost of the property constructed;

                           (c) Any Lien created or assumed by the Company or a
         Restricted Subsidiary on any contract for the sale of any product or
         service or any rights thereunder or any proceeds therefrom, including
         accounts and other receivables, related to the operation or use of any
         property acquired or constructed by the Company or a Restricted
         Subsidiary and created not later than 12 months after (i) such
         acquisition or completion of such construction or (ii) commencement of
         full operation of such property, whichever is later;

                           (d) Any Lien existing on any property of a Restricted
         Subsidiary at the time it becomes a Restricted Subsidiary;

<PAGE>

                           (e) Any refunding or extension of maturity, in whole
         or in part, of any Lien created or assumed in accordance with the
         provisions of subdivision (a), (b), (c) or (d) above or (j) or (bb)
         below, provided that the principal amount of the Indebtedness secured
         by such refunding Lien or extended Lien shall not exceed the principal
         amount of the indebtedness secured by the Lien to be refunded or
         extended outstanding at the time of such refunding or extension and
         that such refunding Lien or extended Lien shall be limited in Lien to
         the same property that secured the Lien so refunded or extended;

                           (f) Any Lien created or assumed by the Company or a
         Restricted Subsidiary to secure loans to the Company or a Restricted
         Subsidiary maturing within 12 months of the date of creation thereof
         and not renewable or extendible by the terms thereof at the option of
         the obligor beyond such 12 months, and made in the ordinary course of
         business;

                           (g) Mechanics' or materialmen's Liens or any Lien or
         charge arising by reason of pledges or deposits to secure payment of
         workmen's compensation or other insurance, good faith deposits in
         connection with tenders or leases of real estate, bids or contracts
         (other than contracts for the payment of money), deposits to secure
         public or statutory obligations, deposits to secure or in lieu of
         surety, stay or appeal bonds and deposits as security for the payment
         of taxes or assessments or other similar charges;

                           (h) Any Lien arising by reason of deposits with or
         the giving of any form of security to any governmental agency or any
         body created or approved by law or governmental regulation for any
         purpose at any time as required by law or governmental regulation as a
         condition to the transaction of any business, or the exercise of any
         privilege or license, or to enable the Company or a Restricted
         Subsidiary to maintain self-insurance or to participate in any fund for
         liability on any insurance risks or in connection with workmen's
         compensation, unemployment insurance, old age pensions or other social
         security or to share in the privileges or benefits required for
         companies participating in such arrangements;

                           (i) Any Lien which is payable, both with respect to
         principal and interest, solely out of the proceeds of oil, gas, coal or
         other minerals or timber to be produced from the property subject
         thereto and to be sold or delivered by the Company or a Restricted
         Subsidiary, including any interest of the character commonly referred
         to as a "production payment";

                           (j) Any Lien created or assumed by a Restricted
         Subsidiary on oil, gas, coal or other mineral or timber property, owned
         or leased by a Restricted Subsidiary to secure loans to such Restricted
         Subsidiary for the purposes of developing such properties, including
         any interest of the character commonly referred to as a "production
         payment"; provided, however, that neither the Company nor any other
         Restricted Subsidiary shall assume or guarantee such loans or otherwise
         be liable in respect thereto;

                           (k) Lions upon rights-of-way;

                           (l) Undetermined Liens and charges Incidental to
         construction or maintenance;

<PAGE>

                           (m) The right reserved to, or vested in, any
         municipality or governmental or other public authority or railroad by
         the terms of any right, power, franchise, grant, license, permit or by
         any provision of law, to terminate or to require annual or other
         periodic payments as a condition to the continuance of such right,
         power, franchise, grant, license or permit;

                           (n) The Lien of taxes and assessments which are not
         at the time delinquent;

                           (o) Any Liens of specified taxes and assessments
         which are delinquent but the validity of which is being contested in
         good faith at the time by the Company or a Restricted Subsidiary;

                           (p) Any Liens reserved in leases for rent and for
         compliance with the terms of the lease in the case of leasehold
         estates;

                           (q) Defects and irregularities in the titles to any
         property (including rights-of-way and easements) which are not material
         to the business of the Company and its Subsidiaries considered as a
         whole;

                           (r) Any Liens securing Indebtedness neither assumed
         nor guaranteed by the Company or a Restricted Subsidiary nor on which
         it customarily pays interest, existing upon real estate or rights in or
         relating to real estate (including rights-of-way and easements)
         acquired by the Company or a Restricted Subsidiary, which Liens do not
         materially impair the use of such property for the purposes for which
         it is held by the Company or such Restricted Subsidiary;

                           (s) Easements, exceptions or reservations in any
         property of the Company or a Restricted Subsidiary granted or reserved
         for the purpose of pipelines, roads, telecommunication equipment and
         cable, streets, alleys, highways, railroad purposes, the removal of
         oil, gas, coal or other minerals or timber, and other like purposes, or
         for the joint or common use of real property, facilities and equipment,
         which do not materially impair the use of such property for the
         purposes for which it is held by the Company or such Restricted
         Subsidiary;

                           (t) Rights reserved to or vested in any municipality
         or public authority to control or regulate any property of the Company
         or a Restricted Subsidiary, or to use such property in any manner which
         does not materially impair the use of such property for the purposes
         far which it is held by the Company or such Restricted Subsidiary;

                           (u) Any obligations or duties, affecting the property
         of the Company or a Restricted Subsidiary, to any municipality or
         public authority with respect to any franchise, grant, license or
         permit;

<PAGE>

                           (v) The Liens of any judgments in an aggregate amount
         not in excess or $1,000,000 or the Lien of any judgment the execution
         of which has been stayed or which has been appealed and secured, if
         necessary, by the filing of an appeal bond;

                           (w) Zoning laws and ordinances;

                           (x) Any Liens existing on any office equipment, data
         processing equipment (including computer and computer peripheral
         equipment) or transportation equipment (including motor vehicles,
         aircraft and marine vessels);

                           (y) Any Liens created or assumed by the Company or a
         Restricted Subsidiary on oil, gas, coal or other mineral or timber
         property owned by the Company or a Restricted Subsidiary;

                           (z) Leases now or hereafter existing and any renewals
         or extensions thereof;

                           (aa) Any Liens created by the Company or a Restricted
         Subsidiary on any contract (or any rights thereunder or proceeds
         therefrom) providing for advances by the Company or such Restricted
         Subsidiary to finance gas exploration and development, which Lien is
         created to secure indebtedness incurred to finance such advances; and

                           (bb) Any Liens not permitted by clauses (a) through
         (aa) above if at the time of, and after giving effect to, the creation
         or assumption of any such Lien, the aggregate of all Indebtedness of
         the Company and its Subsidiaries secured by all such Liens not so
         permitted by clauses (a) through (aa) above do not exceed 5% of
         Consolidated Net Tangible Assets.

                  (c) Section 6.01 Events of Default. Subsections (4) and (5) of
Section 6.01 shall be deleted in their entirety.

                                  ARTICLE THREE

                            MISCELLANEOUS PROVISIONS

         Section 3.1 Execution as Supplemental Indenture. This Supplemental
Indenture is executed and shall be construed as an indenture supplemental to the
Original Indenture and, as provided in Article IX of the Original Indenture,
this Supplemental Indenture forms a part thereof. Except as herein expressly
otherwise defined, the use of the terms and expressions herein is in accordance
with the definitions, uses and constructions contained in the Original
Indenture.

         Section 3.2 Responsibilities for Recitals, etc. The recitals herein
shall be taken as the statements of the Company, and the Trustee assumes no
responsibility for the correctness thereof. The Trustee makes no representations
as to the validity or sufficiency of this Supplemental Indenture.

<PAGE>

         Section 3.3 Provisions Binding on Company's Successor. All of the
covenants, stipulations, promises and agreements made in this Supplemental
Indenture by the Company shall bind its successors and assigns whether so
expressed or not.

         Section 3.4 Governing Law. This Supplemental Indenture shall be deemed
to be a contract made wider the laws of the State of New York and, for all
purposes, shall be construed in accordance with the laws of said State, without
regard to principles of conflicts of law.

         Section 3.5 Execution and Counterparts. This Supplemental Indenture may
be executed in any number of counterparts, each of which shall be an original,
but such counterparts shall together constitute but one and the same instrument.

         Section 3.6 Trust Indenture Act to Control. If and to the extent that
any provision of this Supplemental Indenture limits, qualifies or conflicts with
another provision included in the Original Indenture or in this Supplemental
Indenture which is required to be included in or is deemed to be applicable to
this Supplemental Indenture by any of Sections 310 to 317, inclusive, of the
Trustee Indenture Act of 1939, as amended, such required or other applicable
provision shall control.

<PAGE>

         IN WITNESS WHEREOF, Barrett Resources Corporation has caused this
Supplemental Indenture to be signed and acknowledged by its Chairman of the
Board and its President or one of its Vice Presidents and the same to be
attested to by its Secretary or one of its Assistant Secretaries, and Bankers
Trust Company, as Trustee, has caused this First Supplemental Indenture to be
signed and acknowledged by one of its Vice Presidents and the same to be
attested to by a duly authorized officer, all as of the day and year first
written above.

                                      Barrett Resources

                                      By:          /s/ Peter A. Dea
                                         ---------------------------------------
                                         Name: Peter A. Dea
                                         Title: Chairman and CEO

                                      By:         /s/ J. Frank Keller
                                         ---------------------------------------
                                         Name: J. Frank Keller
                                         Title: Executive Vice President and CFO

Attest: By: /s/ Eugene A. Lang, Jr.
           -------------------------
           Name: Eugene A. Lang, Jr.
           Title: Secretary

                                      Bankers Trust Company, as Trustee

                                      By:        /s/ Irina Golovashchue
                                         ---------------------------------------
                                         Name: Irina Golovashchue
                                         Title: Account Manager

Attest: By:     /s/ Tracy Salzmann
           ----------------------------
           Name: Tracy Salzmann
           Title: Associate<PAGE>
                                                                     EXHIBIT 4.4

                          BARRETT RESOURCES CORPORATION

                                  $150,000,000

                           7.55% SENIOR NOTES DUE 2007

                          SECOND SUPPLEMENTAL INDENTURE

                         BARRETT RESOURCES CORPORATION,

                                   as Issuer,

                                       and

                             BANKERS TRUST COMPANY,

                                   as Trustee

                                   Dated as of

                                 August 2, 2001

<PAGE>

                          SECOND SUPPLEMENTAL INDENTURE

          SECOND SUPPLEMENTAL INDENTURE (this "Second Supplemental Indenture")
dated as of August 2, 2001, by and among Barrett Resources Corporation, a
corporation duly organized and existing under the laws of the State of Delaware
(the "Company"), The Williams Companies, Inc. a corporation duty organized and
existing under the laws of the State of Delaware ("Williams"), Resources
Acquisition Corp., a wholly owned subsidiary of Williams and a corporation duly
organized and existing under the laws of the State of Delaware ("Resources
Acquisition") and Bankers Trust Company, a banking corporation existing under
the laws of the State of New York, as trustee (the "Trustee");

          WHEREAS, the Company and the Trustee have heretofore executed and
delivered an indenture dated as of February 1, 1997, as previously supplemented
and amended (the "Indenture") to provide for the issuance of the Company's 7.55%
Senior Notes due 2007 (the "Notes"); and

          WHEREAS, on May 7, 2001, the Company, Williams, and Resources
Acquisition entered into an Agreement and Plan of Merger (the "Merger
Agreement") pursuant to which, subject to the satisfaction of the conditions set
forth in the Merger Agreement, the Company will be merged with and into
Resources Acquisition (the "Merger"), with Resources Acquisition being the
surviving corporation and being re-named "Williams Production RMT Company" as a
result of the Merger; and

           WHEREAS, the Merger will be consummated pursuant to the terms of the
Merger Agreement, and therefore Resources Acquisition, pursuant to Section 5.02
of the Indenture and subject to the satisfaction of the conditions set forth in
Section 5.01 of the Indenture, will assume all the obligations of the Company
under the Indenture and the Notes; and

          WHEREAS, Section 4.10(b) of the Indenture provides, among other
things, that, any person may become a guarantor of the Notes by executing and
delivering to the Trustee a supplemental indenture which subjects such person to
the provisions of the Indenture as a guarantor; and

          WHEREAS, Williams is willing to become a guarantor of the Notes by
executing and delivering to the Trustee this Second Supplemental Indenture which
will subject Williams to the provisions of the Indenture as a guarantor; and

          WHEREAS, all action on the part of the Company necessary to authorize
its execution, delivery and performance of the Indenture, as further
supplemented by this Second Supplemental Indenture, has been duly taken; and

          WHEREAS, Williams, Resources Acquisition and the Company desire and
have requested the Trustee to join in the execution and delivery of this Second
Supplemental Indenture for the purpose of amending the Indenture.

<PAGE>

          NOW THEREFORE, in consideration of the premises and for other good and
valuable consideration, it is mutually covenanted and agreed for the equal and
ratable benefit of all holders of the Notes as follows, effective upon execution
hereof by the Trustee:

                                    ARTICLE I

                                   DEFINITIONS

         Section 1.1 Definitions. Capitalized terms which are used but not
defined herein shall have the meanings ascribed to such terms in the Indenture.

                                   ARTICLE II

                             AMENDMENTS TO INDENTURE

         Section 2.1 Assumption of Certain Obligations.

                  (a) Upon consummation of the Merger, pursuant to Sections 5,01
and 5.02 of the Indenture, Resources Acquisition hereby assumes all of the
obligations of the Company under the Indenture and the Securities.

                  (b) Upon consummation of the Merger, the Company and the
Trustee hereby acknowledge that Resources Acquisition is a Successor, as such
term is defined in Section 5.01(a) of the Indenture, and therefore Resources
Acquisition shall succeed to, and be substituted for, and may exercise every
right and power of, the Company under the Indenture and the Securities as if
Resources Acquisition had been named therein.

         Section 2.2 Deliveries by the Company

                  (a) Pursuant to Section 5.01(c) of the Indenture and prior to
the consummation of the Merger, the Company shall deliver to the Trustee an
Officers' Certificate and an Opinion of Counsel each stating that the Merger and
the Second Supplemental Indenture comply with the provisions of the Indenture.

         Section 2.3 Guarantee by Williams.

                  (a) Upon consummation of the Merger, Williams shall become a
guarantor of the Securities pursuant to Section 4.10(b) of the Indenture by
executing and delivering to the Trustee (i) this Second Supplemental Indenture,
(ii) the Guarantee, which will become effective upon consummation of the Merger,
in the form attached hereto as Exhibit A and (iii) an Opinion of Counsel and
Officers' Certificate as required by Section 4.10(b) of the Indenture.

                  (b) Upon consummation of the Merger, Williams agrees to be
subject to the provisions of the Indenture as a guarantor.

<PAGE>

                                   ARTICLE III

                            MISCELLANEOUS PROVISIONS

         Section 3.1 Execution as Supplemental Indenture. This Second
Supplemental Indenture is executed and shall be construed as an indenture
supplement to the Indenture and, as provided in Article IX of the Indenture,
this Second Supplemental Indenture forms a part thereof. Except as herein
expressly otherwise defined, the use of the terms and expressions herein is in
accordance with the definitions, uses and constructions contained in the
Indenture.

         Section 3.2 Effect of Second Supplemental Indenture. From and after the
execution and delivery of this Second Supplemental Indenture, the Indenture
shall be deemed to be modified as herein provided, but except as modified
hereby, the Indenture shall continue in full force and effect. The Indenture as
modified hereby shall be read, taken and construed as one and the same
instrument.

         Section 3.3 Notice.

                  (a) Any notice or communication by the Trustee to Resources
Acquisition is duly given if in writing and delivered in person or by express
mail service to the address set forth below:

                           Resources Acquisition Corp.
                        c/o The Williams Companies, Inc.
                               One Williams Center
                              Tulsa, Oklahoma 74172
                             Attention: [__________]

                  (b) Any notice or communication by the Trustee to Williams is
duly given if in writing and delivered in person or by express mail service to
the address set forth below:

                          The Williams Companies, Inc.
                               One Williams Center
                              Tulsa, Oklahoma 74172
                             Attention: [__________]

         Section 3.4 Governing Law. This Second Supplemental Indenture shall be
governed by, and construed and interpreted in accordance with, the internal laws
of the State of New York, without giving effect to the conflict of laws
provisions thereof.

         Section 3.5 Counterparts This Second Supplemental Indenture maybe
executed in separate counterparts each of which shall be an original and all of
which taken together shall constitute one and the same agreement.

                           (SIGNATURE PAGE TO FOLLOW)

<PAGE>

         WITNESS WHEREOF, the Company, Williams, Resources Acquisition and the
Trustee have executed this Second Supplemental Indenture or caused this Second
Supplemental Indenture to be executed by their respective officers thereunto
duly authorized as of August 2, 2001.

                                       BARRETT RESOURCES CORPORATION

                                       By: /s/ Peter A. Dea
                                          --------------------------------------
                                          Name: Peter A. Dea
                                          Title: Chairman and Chief Executive
                                                 Officer

                                       THE WILLIAMS COMPANIES, INC.

                                       By: /s/ James G. Ivey
                                          --------------------------------------
                                          Name: James G. Ivey
                                          Title: Treasurer

                                       RESOURCES ACQUISITION CORP.

                                       By: /s/ James G. Ivey
                                          --------------------------------------
                                          Name: James G. Ivey
                                          Title: Treasurer

                                       BANKERS TRUST COMPANY OF NEW YORK

                                       By: /s/ Irina Golovashchuc
                                          --------------------------------------
                                          Name: Irina Golovashchuc
                                          Title: Account Manager

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