Document:

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VENTAS                                                              EXHIBIT 10.3

Ventas, Inc. 4360 Brownsboro Road Suite 115 Louisville, Kentucky 40207 (502)
357-9000 (502) 357-9001 Fax

T. Richard Riney
Executive Vice President, General Counsel
and Secretary

Direct Dial:  502-357-9020

June 5, 2002

VIA FACSIMILE AND OVERNIGHT COURIER
Mr. James H. Gillenwater, Jr.
Senior Vice President--
  Planning & Development
Kindred Healthcare, Inc.
Kindred Healthcare Operating, Inc.
680 South Fourth Street
Louisville, Kentucky 40202

     Re:  Amended and Restated Master Lease Agreement No. 4 dated as of April
          20, 2001 (the "Master Lease") by and among Kindred Healthcare, Inc.
          and Kindred Healthcare Operating, Inc. (collectively, "Kindred") and
          Ventas Realty, Limited Partnership ("Ventas")

Dear Jim:

     At Kindred's request, Ventas has entered into discussions with HCA, Inc.
("HCA") regarding the purchase and sale of Northern Virginia Community Hospital,
Arlington, Virginia (the "Hospital"). Ventas and Northern Virginia Community
Hospital, LLC, a subsidiary of HCA ("Purchaser") wish to enter into a binding
agreement of purchase and sale of the real property and improvements with
respect to the Hospital. Accordingly, Ventas and Kindred hereby agree as
follows:

     1.   It is acknowledged and agreed that Ventas is under no obligation to
          negotiate, contract for, consummate or otherwise pursue the sale of
          the Hospital, and Ventas may terminate or abandon any such
          negotiations, contract or sale at any time, for any or no reason. If
          Ventas, in its sole discretion, enters into a purchase and sale
          agreement for the Hospital, it will so advise Kindred, and will inform
          Kindred of the projected closing date thereunder, including any
          extensions thereof that may subsequently be agreed by the parties
          thereto, and of any termination of such purchase and sale agreement.

     2.   Effective as of the closing of the purchase and sale of the Hospital
          by Ventas to Purchaser (the "Closing"), the Master Lease shall
          terminate with respect to the Hospital in accordance with the terms of
          Section 40.16 of the Master Lease, and Kindred shall remain obligated
          to perform: (i) all of its applicable obligations under the Master
          Lease with respect to surrender of the Hospital and transfer of its
          operations to Purchaser (as Ventas' designee) upon the termination of
          the Master Lease as to the Hospital; and (ii) all of its
          indemnification and other obligations and liabilities under the Master
          Lease that survive such termination in accordance with the terms
          thereof, including without limitation, the obligations and liabilities
          described in Section 3.4 of the Master Lease (but, except as provided
          in the foregoing clauses (i) and (ii), Kindred shall have no further
          obligation to pay Rent, as defined in the Master Lease, first accruing
          after such termination). Within three (3) business days of the date
          hereof, Kindred shall execute and deliver to Ventas for recordation at
          Closing a termination of memorandum

<PAGE>

Kindred Healthcare, Inc.
Kindred Healthcare Operating, Inc.
June 5, 2002
Page 2

          of lease in the form attached hereto as Exhibit A (the "Termination")
          to release of record that certain Memorandum of Lease recorded August
          7, 1998 in Deed Book 2916 at Page 1, as supplemented by Supplemental
          Memorandum of Lease recorded May 2, 2001 in Deed Book 3141 at Page
          1159 among the land records of Arlington County. If the Closing does
          not occur for any reason by August 1, 2002, Ventas will so notify
          Kindred, this letter agreement shall automatically terminate and be
          void and of no further force or effect, and the Master Lease shall
          remain in full force and effect with respect to the Hospital. In such
          event, the Termination shall be void, and the original executed
          counterpart of the Termination held by Ventas shall be returned to
          Kindred for destruction.

     3.   Kindred shall use reasonable and good faith efforts to fully cooperate
          with Ventas and with Purchaser to consummate the sale of the Hospital,
          including, without limitation, by (i) executing any necessary or
          appropriate documentation to effectuate the sale, (ii) providing
          access to the Hospital at reasonable times for Purchaser to conduct
          its necessary inspections, (iii) assisting Purchaser and HCA and/or
          Ventas with obtaining any licenses (other than computer software
          licenses), permits, approvals or consents necessary or desirable to
          transfer the Hospital and its healthcare operations to Purchaser (the
          "Licenses"), (iv) entering into an operations transfer agreement with
          Purchaser (the "OTA") on terms mutually acceptable to Kindred and
          Purchaser, which will provide, among other matters, at the request and
          direction of Ventas, and in consideration of the termination of the
          Master Lease as to the Hospital to be provided pursuant to paragraph 2
          hereof, that Kindred will transfer to the Purchaser for nominal
          consideration, not to exceed One Hundred Dollars ($100.00), all of
          Kindred's right, title and interest in and to certain (but not all)
          fixtures, furnishings and equipment of Kindred located at the Hospital
          (free and clear of all liens) and in and to all related rights (such
          as, without limitation, guaranties, warranties and service agreements
          relating thereto), as more specifically set forth in the OTA, and all
          of Kindred's right, title and interest in and to those of the Licenses
          held by Kindred that are transferable or assignable, as more
          specifically set forth in the OTA, provided that, with respect to
          tangible property not being transferred to the Purchaser pursuant to
          the OTA, Kindred shall be free to remove such property from the
          Hospital in connection with the Closing, (v) executing any ALTA title
          or other affidavit reasonably required by Commonwealth Land Title
          Insurance Company in connection with the title insurance policy to be
          issued in favor of Purchaser upon the Closing, including, if so
          required, making representations of the same nature as those contained
          in Kindred's title affidavits from recent transactions involving the
          transfer or refinancing of real property owned by Ventas; provided
          that such affidavits shall not impose liabilities or costs on Kindred
          that exceed its obligations relating to title to the Hospital under
          the Master Lease, and (vi) otherwise cooperating with Ventas and
          Purchaser as necessary or desirable to accomplish any of the foregoing
          and to close the sale of the Hospital.

     4.   This letter agreement is for the exclusive benefit of Ventas and
          Kindred, and no other person or entity shall have any rights or be
          entitled to receive any benefits hereunder, whether as a third party
          beneficiary or otherwise.

     5.   Kindred shall cause a copy of the "Consent and Agreement" to this
          letter, following the signature page hereof, to be executed by its
          Leasehold Mortgagees (as defined in the Master Lease) in the space
          provided below, not later than five (5) business days after the date
          hereof. Notwithstanding the execution of this Agreement by Kindred and
          Ventas, the terms of this letter agreement shall be of no further
          force or effect whatsoever without such execution by the Leasehold
          Mortgagees.

<PAGE>

Kindred Healthcare, Inc.
Kindred Healthcare Operating, Inc.
June 5, 2002
Page 3

     6.   Ventas and Kindred hereby acknowledge and agree that this letter
          agreement supercedes that certain letter agreement between Ventas and
          Kindred dated April 1, 2002 regarding the Hospital, which April 1
          letter is of no further force or effect, that this letter agreement,
          together with any documents delivered pursuant hereto, shall
          constitute the entire agreement and understanding of the parties, and
          that, except for the Master Lease, any prior or contemporaneous
          written or oral agreements, undertakings, promises, warranties, or
          covenants regarding the Hospital and not contained herein shall be of
          no further force or effect. Kindred hereby acknowledges and agrees
          that, from and after the Closing, any and all documents and
          information provided by or on behalf of Ventas to Purchaser or HCA
          regarding the real estate and improvements constituting the Hospital
          (as opposed to Kindred's operations) shall not be subject to any
          confidentiality agreement between Ventas and Kindred, including,
          without limitation, Section 40.14 of the Master Lease, provided,
          however, that Ventas hereby confirms to Kindred that it has entered
          into a confidentiality agreement with HCA, consistent with Section
          40.14 (b)(ii)(B)(w) of the Master Lease, requiring HCA to keep
          confidential any information regarding Kindred's operation of the
          Hospital that HCA receives or has received from Ventas.

     7.   Ventas and Kindred hereby acknowledge and agree that, except as
          otherwise expressly provided herein, Kindred's obligations under the
          Master Lease, including, without limitation, the obligation to make
          rental payments with respect to the Hospital, remain in full force and
          effect and are not modified by this letter agreement.

     To evidence your agreement to the foregoing, please sign below in the space
provided and return an executed copy to me via facsimile, with an original to
follow via overnight courier service.

                                   Very Truly Yours,

                                   VENTAS REALTY, LIMITED PARTNERSHIP

                                   By:  Ventas, Inc.

                                   /s/ T. Richard Riney
                                   ---------------------------------------------
                                   T. Richard Riney

                                   Executive Vice President, General Counsel and
                                   Secretary

Agreed and accepted this June 5th, 2002:

KINDRED HEALTHCARE, INC.                      KINDRED HEALTHCARE OPERATING, INC.

By:/s/ James H. Gillenwater, Jr.                By:/s/ James H. Gillenwater, Jr.
   ----------------------------------              -----------------------------
Name: James H. Gillenwater, Jr.                 Name: James H. Gillenwater, Jr.
      -------------------------------                 --------------------------
Title: Senior Vice President                    Title: Senior Vice President
       ------------------------------                 --------------------------

<PAGE>

                              CONSENT AND AGREEMENT

     The undersigned, as Leasehold Mortgagees under the Master Lease referenced
in the preceding letter agreement, hereby consent to, and agree to be bound by,
all of the terms and conditions of such letter agreement and, without limitation
of the foregoing, in the event the Master Lease is terminated as it applies to
the Hospital in accordance with the terms of Section 40.16 of the Master Lease,
the undersigned, as such Leasehold Mortgagees, agree to execute and deliver an
instrument of the nature described in Section 40.16(j) of the Master Lease.

                                                JP Morgan Chase Bank, as Senior
                                                Collateral  Agent and as Second
                                                Priority Collateral Agent

                                                By: /s/Robert Bottamedi
                                                    ----------------------------
                                                Its: Vice President
                                                     ---------------------------

<PAGE>

                                    EXHIBIT A
                                    ---------

================================================================================

                       TERMINATION OF MEMORANDUM OF LEASE

                                  BY AND AMONG

                            KINDRED HEALTHCARE, INC.
                        (f/k/a Vencor Healthcare, Inc.),

                       KINDRED HEALTHCARE OPERATING, INC.
                         (f/k/a Vencor Operating, Inc.),

                                       AND

                       VENTAS REALTY, LIMITED PARTNERSHIP

================================================================================

                 Facility No.:              VA-4617

                 Property Address:          Northern Virginia Community Hospital
                                            601 South Carlin Springs Road
                                            Arlington, Virginia
                                            (Arlington County)

<PAGE>

                       TERMINATION OF MEMORANDUM OF LEASE

     THIS TERMINATION OF MEMORANDUM OF LEASE (hereinafter this "Termination") is
                                                                -----------
to be effective as of the 21st day of June, 2002 (the "Effective Date"), and is
                                                       --------------
by and among VENTAS REALTY, LIMITED PARTNERSHIP, a Delaware limited partnership
(together with its successors and assigns, "VRLP") having an office at 4360
                                            ----
Brownsboro Road, Suite 115, Louisville, Kentucky 40207, KINDRED HEALTHCARE,
INC., a Delaware corporation (f/k/a Vencor Healthcare, Inc.) ("Kindred"), and
                                                               -------
KINDRED HEALTHCARE OPERATING, INC., a Delaware corporation (f/k/a Vencor
Operating, Inc.) ("Operator"; Operator, jointly and severally with Kindred and
                   --------
permitted successors and assignees of Operator and Kindred, "Tenant"), both
                                                             ------
having an office at 680 South 4th Avenue, Louisville, Kentucky 40202.

                                    RECITALS

     A. VRLP and Tenant are parties to that certain Master Lease Agreement No. 4
dated as of April 30, 1998, as amended and restated by that certain Amended and
Restated Master Lease Agreement No. 4 dated as of April 20, 2001 (the "Lease")
                                                                       -----
demising to Tenant (i) the real property described on Exhibit A attached hereto
                                                      ---------
and made a part hereof, together with the improvements thereon (the "Premises"),
                                                                     --------
and (ii) multiple other properties.

     B. A Memorandum of Lease relating to the Lease as it affects the Premises
was heretofore filed for record on August 7, 1998 in Deed Book 2916 at Page 1,
as supplemented by Supplemental Memorandum of Lease filed for record May 2, 2001
in Deed Book 3141 at Page 1159, among the land records of Arlington County,
Virginia (the "Memorandum").
               ----------

     C. The Lease has been terminated as to the Premises upon and subject to the
terms and conditions of that certain letter agreement dated June 5, 2002 between
VRLP and Tenant (the "Termination Letter"), and Lessor and Tenant accordingly
desire to have the Memorandum terminated and released of record.

     NOW, THEREFORE, in consideration of the premises and other good and
valuable consideration, the parties hereby agree as follows:

1.   Lessor and Tenant hereby terminate and release the Memorandum.

2.   This Termination is being executed and recorded solely to give notice of
     the termination of the Lease as to the Premises pursuant to the Termination
     Letter, and to terminate the Memorandum and release said Memorandum of
     record.

3.   This Termination may be signed in any number of counterparts, each of which
     shall be an original, with the same effect as if the signatures thereto
     were upon the same instrument.

                            [Signature Page Follows]

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed these presents with an
intended effective date of June 21, 2002.

                                        TENANT:

                                        KINDRED HEALTHCARE, INC., a
                                        Delaware corporation formerly known as
                                        Vencor Healthcare, Inc.

                                        By: /s/ James H. Gillenwater, Jr.
                                           -------------------------------
                                        Name:  James H. Gillenwater, Jr.
                                             -----------------------------
                                        Title: Senior Vice President
                                              ----------------------------

                                        TENANT:

                                        KINDRED HEALTHCARE OPERATING, INC., a
                                        Delaware corporation formerly known as
                                        Vencor Operating, Inc.

                                        By: /s/ James H. Gillenwater, Jr.
                                           ------------------------------
                                        Name:  James H. Gillenwater, Jr.
                                             ----------------------------
                                        Title: Senior Vice President
                                              ---------------------------

                                        VRLP:

                                        VENTAS REALTY, LIMITED
                                        PARTNERSHIP, a Delaware limited
                                        partnership, successor-in-interest to
                                        Vencor Hospitals East, Inc.

                                        By: Ventas, Inc., a Delaware
                                            corporation, its general partner

                                        By: /s/T. Richard Riney
                                           ------------------------------
                                        Name: T. Richard Riney
                                             ----------------------------
                                        Title: Executive Vice President
                                              ---------------------------
                                              and General Counsel
                                              ---------------------------

                                       2

<PAGE>

                                 Acknowledgments

STATE OF KY
         ----------------------- )

                                 )
COUNTY OF Jefferson
          -----------------------)

     The foregoing instrument was acknowledged before me this 7th day of June,
2002, by James H. Gillenwater, Jr., as Senior Vice President of KINDRED
HEALTHCARE, INC., a Delaware corporation, on behalf of the corporation.

     My commission expires:_____________________________.

                                        /s/Kim Oakley
                                        ----------------------------------------
                                        Notary Public
                                        [Seal]
STATE OF KY
         ----------------------- )

                                 )
COUNTY OF Jefferson
          -----------------------

     The foregoing instrument was acknowledged before me this 7th day of June
2002, by James H. Gillenwater, Jr., as Senior Vice President of KINDRED
HEALTHCARE OPERATING, INC., a Delaware corporation, on behalf of the
corporation.

     My commission expires:_____________________________.

                                        /s/Kim Oakley
                                        ----------------------------------------
                                        Notary Public
                                        [Seal]

                                       3

<PAGE>

STATE OF Kentucky
         ----------------------- )

                                 )
COUNTY OF Jefferson
          -----------------------)

     The foregoing instrument was acknowledged before me on June 12, 2002, by
T. Richard Riney, EVP and Gen. Counsel of VENTAS, INC., a Delaware corporation,
in its capacity as the general partner of VENTAS REALTY, LIMITED PARTNERSHIP, a
Delaware limited partnership, on behalf of the corporation, in its capacity as
the general partner on behalf of the aforesaid limited partnership.

     My commission expires: December 9, 2002
                            ----------------------------------------.

                                        /s/Barbara F. Thompson
                                        ----------------------------------------
                                        Notary Public
                                        [Seal]

                                        4

<PAGE>

                            EXHIBIT A TO TERMINATION
                            ------------------------

                                  The Premises

PARCEL I:
Parcel A of a Subdivision of the Properties of Northern Virginia Doctors
Hospital Corporation and NVDH Corporation, as the same is duly dedicated,
platted and recorded in Deed Book 2022 at page 739, among the land records of
Arlington County, Virginia.

PARCEL II:
"Parking Structure Unit", NORTHERN VIRGINIA DOCTORS MEDICAL CENTER, a
Condominium, in accordance with the Declaration of Condominium and Exhibits
attached thereto, recorded in Deed Book 2044 at Page 1051, and as amended in
Deed Book 2083 at Page 284, and any additional amendments pursuant thereto,
among the land records of Arlington County, Virginia.

                                       5<PAGE>

                                                                    EXHIBIT 10.4

                          REGISTRATION RIGHTS AGREEMENT

     This Registration Rights Agreement (this "Agreement") is made and entered
into as of ________ ___, 2002, by and among DORCHESTER MINERALS, L.P., a
Delaware limited partnership (the "Company"), and the parties listed on Annex A
hereto (each, a "Holder" and collectively, the "Holders");

                              W I T N E S S E T H:

     WHEREAS, the Company, Dorchester Hugoton, Ltd., Republic Royalty Company,
Spinnaker Royalty Company, L.P. and certain other parties are parties to that
certain Combination Agreement, dated as of December 13, 2001 (the "Combination
Agreement"), pursuant to which Dorchester Hugoton, Ltd., Republic Royalty
Company and Spinnaker Royalty Company, L.P. have agreed to combine their
business and properties into the Company (the "Combination"); and

     WHEREAS, in connection with the Combination, the Holders will receive LP
Units as the Merger Consideration;

     WHEREAS, the Company has agreed to register the LP Units as set forth
herein; and

     WHEREAS, capitalized terms not defined herein have the meaning given to
them in the Combination Agreement;

     NOW, THEREFORE, in consideration of the premises and the mutual terms,
covenants and conditions herein contained, and intending to be legally bound
hereby, the parties hereto hereby agree as follows:

     The Company and the Holders covenant and agree as follows:

     1. Definitions. For purposes of this Agreement:

     (a) The term "Best Efforts" means a Person's reasonable best efforts in
accordance with reasonable commercial practice and without the incurrence of
unreasonable expense.

     (b) The term "Commission" means the Securities and Exchange Commission.

     (c) The term "Expenses" means all expenses incident to the Company's
performance of or compliance with Section 2.1 or 2.2, including, without
limitation, underwriting discounts and commissions, all registration, filing and
National Association of Securities Dealers fees, all fees and expenses of
complying with securities or blue sky laws, all word processing, duplicating and
printing expenses, messenger and delivery expenses, the fees and disbursements
of counsel for the Company and of its independent public accountants, including
the expenses of any special audits or "cold comfort" letters required by or
incident to such performance and compliance, the reasonable fees and
disbursements of special counsel to the Holders selected by the Requisite
Threshold, premiums and other costs of policies of insurance against liabilities
arising out of the public offering of the Registrable Securities being
registered and any fees and disbursements of underwriters customarily paid by
issuers or sellers of securities

<PAGE>

     (d) The term "Person" means an individual, partnership, corporation,
limited liability company, trust or unincorporated organization, or government
or agency or political subdivision thereof.

     (e) The terms "register," "registered" and "registration" refer to a
registration of securities effected by preparing and filing a registration
statement or similar document in compliance with the Securities Act (as defined
below), and the declaration or ordering of effectiveness of such registration
statement or document.

     (f) The term "Registrable Securities" means the LP Units received by a
Holder pursuant to the Combination Agreement. As to any Registrable Security,
once issued such security shall cease to be a Restricted Security when (i) it
has been effectively registered under the Securities Act and disposed of in
accordance with the registration statement covering it, (ii) it is sold pursuant
to Rule 144 or Rule 145 (or any similar provisions then in force) under the
Securities Act or in a private transaction in which the Holder's rights under
this Agreement are not assigned.

     (g) The term "Requisite Threshold" means any holder or holders of an
aggregate of at least fifty-one percent (51%) of all Registrable Securities.

     (h) The term "Securities Act" means the Securities Act of 1933, as amended,
and the term "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

     2. Registration.

     2.1 Registration on Request.

          (a) From time to time after six (6) months from the date of the
closing of the Combination, upon the written request of the Requisite Threshold
that the Company effect the registration under the Securities Act of at least
twenty-five percent (25%) of the Registrable Securities held by the requesting
party or parties and specifying the intended method of disposition thereof and
whether or not such requested registration is to be an underwritten offering,
the parties hereto agree as follows:

               (i) the Company will promptly give written notice of such
requested registration to all other holders of Registrable Securities, if any;
and

               (ii) promptly after the performance of any obligations imposed
under clause (i) of this Section 2.1(a), and subject to the limitations set
forth in Section 2.1(c) and Section 3, the Company will use its Best Efforts to
effect the registration under the Securities Act of the Registrable Securities
that the Company has been requested to register by the Requisite Threshold and
the other holders of Registrable Securities by written request given to the
Company within thirty (30) days after the giving of such written notice by the
Company (which request shall specify the intended method of disposition of such
Registrable Securities) and to qualify the securities subject to such
registration under the securities laws of such states as the Requisite Threshold
shall reasonably request, all to the extent requisite to permit the disposition
(in accordance with the intended methods thereof as aforesaid) of the
Registrable Securities to be

                                       2

<PAGE>

registered and cause such registration to remain effective for a period of not
less than one hundred eighty (180) days following its effective date or such
shorter period as shall terminate (A) when all Registrable Securities covered by
such registration statement have been sold or (B) fourteen (14) months from the
date of the closing of the Combination. The Company shall not be required to
qualify the securities subject to such registration in any jurisdiction where,
as a result thereof, the Company would become subject to general service of
process or to taxation or to qualification to do business as a foreign
corporation or partnership doing business in such jurisdiction solely as a
result of such qualification.

          (b) Registration Statement Form. Subject to Section 2.1(c),
registrations under this Section 2.1 shall be on such appropriate registration
form of the Commission as shall be reasonably selected by the Company and
reasonably acceptable to the Requisite Threshold and as shall permit the
disposition of such Registrable Securities in accordance with the intended
method or methods of disposition specified in the request for such registration.

          (c) Limitations with respect to Requested Registrations.

               (i) The Company shall have no obligation to take or continue any
action to effect a requested registration under this Section 2.1 (A) after the
Company has effected one (1) registration that is requested pursuant to this
Section 2.1; provided that, a registration requested pursuant to this Section
2.1 shall not be deemed to have been effected (1) unless a registration
statement with respect thereto has been declared effective for a period of at
least ninety (90) days, (2) if after a registration statement has become
effective, such registration is terminated by any stop order, injunction or
other order or requirement of the Commission or other governmental agency or
court, or (3) if the conditions to closing specified in the purchase agreement
or underwriting agreement entered into in connection with such registration are
not satisfied, other than as a result of the voluntary termination of such
offering by the Requisite Threshold; or (B) if the Company is eligible to effect
a registration statement of its securities on Form S-3 or any successor form
under the Securities Act.

               (ii) Notwithstanding the foregoing, if the Company shall furnish,
to the Holders requesting a registration statement pursuant to this Section 2.1,
a certificate signed by the Chief Executive Officer of the Company stating that,
in the good faith judgment of the Board of Managers of the Company, a
postponement would be in the best interests of the Company and its partners due
to a pending transaction, investigation or other event, then the Company shall
have the right to defer such filing for a period of not more than one hundred
eighty (180) days following receipt of the request (made pursuant to Section
2.1(a) hereof) of the Requisite Threshold.

               (iii) In addition, the Company shall not be obligated to effect,
or to take any action to effect, any registration pursuant to this Section 2.1
if the Requisite Threshold propose to dispose of shares of Registrable
Securities that may be immediately registered on Form S-3 pursuant to a request
made pursuant to Section 2.2 below.

          (d) Selection of Underwriters. If a requested registration pursuant to
this Section 2.1 involves an underwritten offering, the underwriter or
underwriters thereof shall be selected by the Company and reasonably acceptable
to the Requisite Threshold.

                                       3

<PAGE>

          (e) Priority in Requested Registrations. If a requested registration
pursuant to this Section 2.1 involves an underwritten offering, and the managing
underwriter(s) shall advise the Company that, in its opinion, the number of
securities requested to be included in such registration exceeds the number that
can be sold in such offering within a price range acceptable to the Requisite
Threshold, the Company will include in such registration the number of
Registrable Securities that the Company is so advised can be sold in such
offering, pro-rata among the Registrable Securities requested to be included in
such registration.

     2.2 Form S-3 Registration.

          (a) Once the Company is eligible to effect a registration of its
securities on Form S-3 or any successor form under the Securities Act, if the
Company receives the written request from the Requisite Threshold to register
not less than eighty percent (80%) of the Registrable Securities, the Company
shall:

               (i) promptly give written notice of the proposed registration,
and any related qualification or compliance, to all other Holders;

               (ii) as soon as practicable and subject to the limitations set
forth in Section 2.2(c) and Section 3, effect a shelf registration statement on
form S-3 or any successor form under the Securities Act for an offering to be
made on a continuous basis pursuant to Rule 415 under the Securities Act to
effect the registration of the Registrable Securities covered by such request
and to qualify the securities subject to such registration under the securities
laws of such states as the Requisite Threshold shall reasonably request as would
permit or facilitate the sale and distribution of all or such portion of such
Holders' Registrable Securities as are specified in such request, together with
all or such portion of the Registrable Securities of any other Holder or Holders
joining in such request as are specified in a written request given within
fifteen (15) days after receipt of such written notice from the Company and
cause such registration to remain effective for a period of not less than two
(2) years following its effective date or such shorter period as shall terminate
when all Registrable Securities covered by such registration statement have been
sold. The offering of Registrable Securities under this Section 2.2 shall be
pursuant to a firm commitment underwritten offering.

          (b) Limitations with respect to Form S-3 Registration. The Company
shall not be obligated to effect any such Form S-3 Registration, qualification
or compliance, pursuant to this Section 2.2: (i) if Form S-3 is not available
for such offering by the Holders; (ii) if the Company shall furnish, to the
Holders requesting a registration statement pursuant to this Section 2.2, a
certificate signed by the Chief Executive Officer of the Company stating that,
in the good faith judgment of the Board of Managers of the Company, a
postponement would be in the best interests of the Company and its partners due
to a pending transaction, investigation or other event, then the Company shall
have the right to defer such filing of the Form S-3 registration statement for a
period of not more than one hundred eighty (180) days after receipt of the
request of the Requisite Threshold under this Section 2.2; or (iv) in any
particular jurisdiction in which the Company would be required to qualify to do
business or to execute a general consent to service of process in effecting such
Form S-3 registration, qualification or compliance.

          (c) Subject to the foregoing, the Company shall file a Form S-3
registration statement covering the Registrable Securities as soon as
practicable after receipt of the request or

                                       4

<PAGE>

requests of the Requisite Threshold. Registrations effected pursuant to this
Section 2.2 shall not be counted as demands for registration or registrations
effected pursuant to Sections 2.1. The Company shall not be required to effect
more than one (1) registration requested pursuant to this Section 2.2.

          (d) A registration requested pursuant to Section 2.2 shall not be
deemed to have been effected (i) unless it has become effective and remained
effective for the period specified in Section 2.2(a) or until the Registrable
Securities registered under such registration statement have been sold, or (ii)
if, after it has become effective, such registration is terminated by a stop
order, injunction or other order of the Commission or other governmental agency
or court.

          (e) Selection of Underwriters. The underwriter or underwriters of an
offering pursuant to this Section 2.2 shall be selected by the Company and
reasonably acceptable to the Requisite Threshold.

          (f) Priority in Form S-3 Registrations. If the managing underwriter(s)
of an offering pursuant to this Section 2.2 shall advise the Company that, in
its opinion, the number of securities requested to be included in such
registration exceeds the number that can be sold in such offering within a price
range acceptable to the Requisite Threshold, the Company will include in such
registration the number of Registrable Securities that the Company is so advised
can be sold in such offering, pro-rata among the Registrable Securities
requested to be included in such registration.

     2.3 Termination of Registration Rights. The Holders will have no rights to
request registration under this Section 2 after five (5) years from the date of
the closing of the Combination.

     3. Registration Procedures.

          (a) The Company will use its Best Efforts to furnish to each Holder
requesting registration pursuant to this Agreement a copy of the requisite
registration statement, each amendment and supplement to such registration
statement and a reasonable number of copies of the prospectus included in such
registration statement (including each preliminary prospectus), as each such
Holder may reasonably request in order to facilitate such Holder's disposition
of its securities covered by such registration statement.

          (b) The Company will use its Best Efforts to notify the Holders
requesting registration pursuant to this Agreement, at any time when a
prospectus relating to the requisite registration statement is required to be
delivered under the Securities Act (within the period that the Company is
required to keep such registration statement effective), of the happening of any
event as a result of which the prospectus included in the requisite registration
statement (as then in effect) contains an untrue statement of a material fact or
omits to state any material fact required to be stated in the prospectus or that
is necessary to make the statements in the prospectus, in light of the
circumstances then existing, not misleading. The Company will prepare (and, as
soon as reasonably practicable, file) a supplement or amendment to that
prospectus so that, as thereafter delivered to the purchasers of those
securities covered by such registration statement, that prospectus will not
contain an untrue statement of a material fact or

                                       5

<PAGE>

omit to state any material fact required to be stated in the prospectus or that
is necessary to make the statements in the prospectus, in light of the
circumstances then existing, not misleading. However, if the Board of Managers
of the Company determines in its good faith judgment that filing any supplement
or amendment to such registration statement to keep such registration statement
available for use by such Holders for resales of the securities covered by such
registration statement would require the Company to disclose material
information that the Company has a bona fide business purpose for preserving as
confidential, then, upon the Company's notice to each Holder (the "Suspension
Notice"), the Company's obligation to supplement or amend such registration
statement will be suspended. That suspension will remain in effect until the
Company notifies such Holders in writing that the reasons for suspending those
obligations no longer exist and the Company amends or supplements such
registration statement as may be required. The Company does not have the right
to delay filing any supplement or amendment for more than sixty (60) consecutive
days or ninety (90) days (including consecutive and non-consecutive days). As
soon as a Holder receives a Suspension Notice from the Company under this
Section 3(b), that Holder will immediately discontinue disposing of securities
covered by such registration statement until that Holder receives copies of the
supplemented or amended prospectus referred to in this Section 3(b). At the
Company's requests, each Holder will deliver to the Company all copies of the
prospectus covering such securities current at the time of that request.

          (c) After receiving notice of any stop order issued or threatened by
the Commission with respect to the requisite registration statement, the Company
will use its Best Efforts to (i) advise the Holders and (ii) take all actions
required to prevent the Commission from entering that stop order or and to
remove it if it has been entered.

          (d) The Company will use its Best Efforts to cause all securities
included in the requisite registration statement to be listed, by the date of
the first sale of such securities pursuant to such registration statement, on
the principal securities exchange that the Company's LP Units are then listed
on.

          (e) Each Holder will sell its Registrable Securities registered in
accordance with Section 2 in compliance the prospectus delivery requirements
under the Securities Act.

          (f) The Company may require the Holders to furnish to the Company
information regarding the Holders and the distribution of the securities covered
by the requisite registration statement as the Company may from time to time
request in writing. Each Holder will (i) notify the Company as promptly as
practicable of any inaccuracy or change in information that Holder previously
furnished to the Company or of the occurrence of any event that would cause any
prospectus relating to such securities to (A) contain an untrue statement of a
material fact regarding that Holder or its resale of such securities or (B) omit
to state any material fact regarding that Holder or its resale of such
securities required to be stated in that prospectus or necessary to make the
statements in that prospectus not misleading in light of the circumstances then
existing and (ii) promptly furnish to the Company any additional information so
that the prospectus will not contain, with respect to that Holder or its
distribution of such securities, an untrue statement of a material fact or omit
to state a material fact required to be stated in it or necessary to make the
statements in that prospectus, in light of the circumstances then existing, not
misleading.

                                       6

<PAGE>

     4. Expenses. Except as set forth in Section 6, the Holders of Registrable
Securities included in any registration requested pursuant to Section 2 will pay
all Expenses in connection with such registration pro-rata among the Registrable
Securities requested to be included in such registration.

     5. Market-Standoff Agreement

          (a) Market-Standoff Period; Agreement. In connection with the first
follow-on offering of the Company's securities by the Company for cash after the
closing date of the Combination and upon request of the Company or managing
underwriter(s) of such offering of the Company's securities, each Holder agrees
not to sell, make any short sale of, loan, grant any option for the purchase of,
or otherwise dispose of any securities of the Company (other than those included
in the registration) without the prior written consent of the Company or the
managing underwriter(s), as the case may be, for such period of time (not to
exceed one hundred eighty (180_ days) from the effective date of such
registration as may be requested by the Company or the managing underwriter(s)
and to execute an agreement reflecting the foregoing as may be requested by the
managing underwriter(s) at the time of the Company's follow-on offering. The
managing underwriter(s) are intended third party beneficiaries of this Section 5
and shall have the right, power and authority to enforce the provisions of this
Section 5 as though they were a party hereto.

          (b) Limitations. The obligations described in Section 5(a) shall not
apply to a registration relating solely to employee benefit plans, or to a
registration relating solely to a transaction pursuant to Rule 145 under the
Securities Act.

          (c) Stop-Transfer Instructions. In order to enforce the foregoing
covenants, the Company may impose stop-transfer instructions with respect to the
Registrable Securities of each Holder.

          (d) Transferees Bound. Each Holder agrees that it will not transfer
securities of the Company unless each transferee agrees in writing to be bound
by all of the provisions of this Section 6.

     6. Indemnification. In the event any Registrable Securities are included in
a registration statement under this Agreement:

          (a) To the extent permitted by law, the Company will indemnify and
hold harmless the Holder, the officers and directors of the Holder and each
other Person, if any, who controls the Holder within the meaning of Section 15
of the Securities Act, against any losses, claims, damages, liabilities or
expenses, joint or several, to which any such Person may become subject under
the Securities Act or otherwise, insofar as such losses, claims, damages,
liabilities or expenses (or actions in respect thereof) arise out of or are
based upon (i) any untrue statement or alleged untrue statement of a material
fact contained in any registration statement under which such Registrable
Securities were registered under the Securities Act pursuant hereto, or any
post-effective amendment thereof, or the omission or alleged omission therefrom
of a material fact required to be stated therein or necessary to make the
statements therein not misleading, or (ii) any untrue statement or alleged
untrue statement of a material fact contained in any preliminary prospectus, if
used prior to the effective date of the registration statement and not corrected
in the

                                       7

<PAGE>

final prospectus, or contained in the final prospectus (as amended or
supplemented, if the Company shall have filed with the Commission any amendment
thereof or supplement thereto), or the omission or alleged omission therefrom of
a material fact required to be stated therein or necessary to make the
statements therein not misleading; and will reimburse any such Person for any
legal or other expenses reasonably incurred by such Person in connection with
investigating or defending any such loss, claim, damage, liability or expense;
provided, however, that the indemnity agreement contained in this Section 6(a)
shall not apply to amounts paid in settlement of any such loss, claim, damage,
liability or expense if such settlement is effected without the consent of the
Company (which consent shall not be unreasonably withheld); and provided further
that the Company shall not be liable in any such case to the extent that any
such loss, claim, damage, liability or expense arises out of or is based upon
any such untrue statement or omission or alleged untrue statement or omission
which has been made in said registration statement, preliminary prospectus,
prospectus or amendment or supplement or omitted therefrom in reliance upon and
in conformity with information furnished in writing to the Company by the Holder
specifically for use in the preparation thereof.

          (b) To the extent permitted by law, the Holder will indemnify and hold
harmless the (i) Company, (ii) the Company's general partner and the general
partner of the Company's general partner (collectively, the "GP Entities"),
(iii) each of the managers or directors of the Company or the GP Entities, (iv)
each of the Company's or the GP Entities' officers who has signed the
registration statement and (v) each Person, if any, who controls the Company
within the meaning of Section 15 of the Securities Act against any losses,
claims, damages, liabilities or expenses, joint or several, to which the Company
or any such Person, may become subject under the Securities Act or otherwise,
and will reimburse the Company or any such Person for any legal or other
expenses reasonably incurred by the Company or such Person in connection with
investigating or defending any such loss, claim, damage, liability or expense,
but only insofar as such losses, claims, damages, liabilities or expenses (or
actions in respect thereof) arise out of or are based upon any untrue statement
or omission or alleged untrue statement or omission of a material fact referred
to in clause (i) or (ii) of Section 6(a) hereof, in each case to the extent (and
only to the extent) that such untrue statement or omission or alleged untrue
statement or omission was made in reliance upon and in conformity with
information furnished in writing by or on behalf of the Holder specifically for
use in connection with such registration.

          (c) Promptly after receipt by an indemnified party under this Section
6 of notice of the commencement of any action (including any governmental
action), such indemnified party will, if a claim in respect thereof is to be
made against an indemnifying party under this Section 6, notify the indemnifying
party in writing of the commencement thereof and the indemnifying party shall
have the right to participate in, and, to the extent the indemnifying party so
desires, to assume the defense thereof with counsel mutually satisfactory to the
parties; provided, however, that an indemnified party shall have the right to
retain its own counsel, with the fees and expenses to be paid by the
indemnifying party, if representation of such indemnified party by the counsel
retained by the indemnifying party would be inappropriate due to actual or
potential differing interests between such indemnified party and any other party
represented by such counsel in such proceeding. The failure to so notify an
indemnifying party within a reasonable time of the commencement of any such
action, if prejudicial to its ability to defend such action, shall relieve such
indemnifying party of any liability to the indemnified party under

                                       8

<PAGE>

this Section 6, but the omission so to notify the indemnifying party will not
relieve it of any liability that it may have to any indemnified party otherwise
than under this Section 6.

          (d) If the indemnification provided for in this Section 6 from the
indemnifying party is unavailable to an indemnified party hereunder in respect
of any losses, claims, damages, liabilities or expenses referred to herein, then
the indemnifying party, in lieu of indemnifying such indemnified party, shall
contribute to the amount paid or payable by such indemnified party as a result
of such losses, claims, damages, liabilities or expenses in such proportion as
is appropriate to reflect the relative fault of the indemnifying party and
indemnified parties in connection with the actions which resulted in such
losses, claims, damages, liabilities or expenses, as well as any other relevant
equitable considerations. The relative fault of such indemnifying party and
indemnified parties shall be determined by reference to, among other things,
whether any action in question, including any untrue or alleged untrue statement
of a material fact or omission or alleged omission to state a material fact, has
been made by, or relates to information supplied by, such indemnifying party or
indemnified parties, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such action. The amount paid
or payable by a party as a result of the losses, claims, damages, liabilities
and expenses referred to above shall be deemed to include, subject to the
limitations set forth in Section 6 hereof, any legal or other fees or expenses
reasonably incurred by such party in connection with any investigation or
proceeding.

     The parties hereto agree that it would not be just and equitable if
contribution pursuant to this Section 6 were determined by pro rata allocation
or by any other method of allocation which does not take into account the
equitable considerations referred to in the immediately preceding paragraph. No
Person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Securities Act) shall be entitled to contribution from any Person
who was not guilty of such fraudulent misrepresentation.

     7. Reports Under Exchange Act. With a view to making available to the
Holder the benefits of Rule 144 and Rule 145 under the Securities Act and any
other rule or regulation of the Commission that may at any time permit the
Holder to sell securities of the Company to the public without registration, the
Company agrees to:

          (a) file with the Commission in a timely manner all reports and other
documents required of the Company under the Securities Act and the Exchange Act,
and the rules and regulations adopted by the Commission thereunder; and

          (b) furnish to the Holder such information as may be reasonably
requested in availing the Holder of any rule or regulation of the Commission
that permits the sale of any securities without registration.

     8. Assignment of Registration Rights. The right to cause the Company to
register Registrable Securities pursuant to this Agreement may not be assigned,
in whole or in part, by the Holder without the prior written consent of the
Company.

     9. Condition to the Obligation of the Parties. The effectiveness of this
Agreement and the respective obligations of each party to effect the
transactions contemplated by this

                                        9

<PAGE>

Agreement shall be subject to the fulfillment of the condition that the
Combination shall have been consummated in accordance with the terms of the
Combination Agreement.

     10. Notices. All notices and other communications provided for or permitted
hereunder shall be made in writing and shall be deemed to have been duly given
or made if (i) delivered personally, (b) expedited delivery service or (c)
certified or registered mail, postage prepaid. Any such notice shall be deemed
given upon its receipt at the following address:

          (a)  If to a Holder, initially at

               c/o Energy Trust, LLC
               551 Fifth Avenue, 37th Floor
               New York, New York  10176
               Fax: ___________________

     and thereafter at such other address, notice of which is given to the
Company in accordance with this Section 10; and

          (b)  If to the Company, initially at

               Dorchester Minerals, L.P.
               c/o Dorchester Minerals Management GP LLC
               3738 Oak Lawn Avenue, Suite 300
               Dallas, Texas  75219
               Attention: William Casey McManemin
               Fax: (214) 559-0301

     and thereafter at such other address, notice of which is given in
accordance with this Section 10.

     11. Counterparts. This Agreement may be executed in two or more
counterparts, all of which will be considered one and the same agreement and
will become effective when one or more counterparts have been signed by each of
the parties and delivered to the other parties, it being understood that all
parties need not sign the same counterpart.

     12. Entire Agreement. This Agreement constitutes the entire agreement and
supersedes all prior agreements and understandings, both written and oral, among
the parties with respect to the subject matter of this Agreement. No provision
of this Agreement will be construed as the basis for any liability of the
Company in connection with the Combination Agreement or any of the transactions
contemplated thereby (other than the registration of the Registrable Securities
pursuant to this Agreement).

     13. Governing Law; Jurisdiction. THIS AGREEMENT WILL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF TEXAS, WITHOUT
REGARD TO PRINCIPLES OF CONFLICTS OF LAW REQUIRING THE APPLICATION OF THE LAW OF
ANOTHER STATE, EXCEPT TO THE EXTENT THE DGCL EXPRESSLY APPLIES TO A PARTICULAR
MATTER EACH OF THE COMPANY AND THE HOLDERS HEREBY IRREVOCABLY AND
UNCONDITIONALLY

                                       10

<PAGE>

CONSENTS TO SUBMIT TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE STATE OF
TEXAS AND OF THE UNITED STATES OF AMERICA LOCATED IN TEXAS (THE "TEXAS COURTS"),
FOR ANY LITIGATION ARISING OUT OF OR RELATING TO THIS AGREEMENT AND THE
TRANSACTIONS CONTEMPLATED HEREBY (AND AGREES NOT TO COMMENCE ANY LITIGATION
RELATING THERETO EXCEPT IN SUCH COURTS), WAIVES ANY OBJECTION TO THE LAYING OF
VENUE OF ANY SUCH LITIGATION IN THE TEXAS COURTS AND AGREES NOT TO PLEAD OR
CLAIM IN ANY TEXAS COURT THAT SUCH LITIGATION BROUGHT THEREIN HAS BEEN BROUGHT
IN ANY INCOVENIENT FORUM.

     14. Amendments and Waivers. The provisions of this Agreement, including the
provisions of this sentence, may not be amended, modified or supplemented, and
waivers or consents to departures from the provisions hereof (which may be
generally or in a particular instance and either retroactively or prospectively)
may not be given, except pursuant to a writing signed by the Company and the
holders of at least a majority of the Registrable Securities.

                            [Signature page follows]

                                       11

<PAGE>

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

                              Company:

                                   Dorchester Minerals, L.P.

                                   By:  Dorchester Minerals Management LP, its
                                        general partner

                                   By:  Dorchester Minerals Management GP LLC,
                                        its general partner

                                   By:__________________________________________
                                        William Casey McManemin, Chief Executive
                                        Officer

                              Holders:

                              Boston Safe Deposit and Trust Company, as Trustee
                              for the Lucent Technologies, Inc. Master Pension
                              Trust

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

                              State Street Bank and Trust Company, as Trustee
                              for the AT&T Master Pension Trust

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

                              Harris Savings and Trust Bank, as Trustee for the
                              Delta Airlines Master Trust

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

                                       12

<PAGE>

                              The Chase Manhattan Bank, as Trustee for the
                              Boeing Company Employee Retirement Plans Master
                              Trust

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

                              Mellon Bank, N.A., as Trustee for the Bell
                              Atlantic Master Trust

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

                              Boston Safe Deposit and Trust Company, as Trustee
                              for the Kodak Retirement Income Plan Trust

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

                              Boston Safe Deposit and Trust Company, as Trustee
                              for the Eastman Retirement Assistance Plan Trust

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

                                       13

<PAGE>

                                     ANNEX A

                                 List of Holders

Boston Safe Deposit and Trust Company, as Trustee for the Lucent Technologies,
Inc. Master Pension Trust

State Street Bank and Trust Company, as Trustee for the AT&T Master Pension
Trust

Harris Savings and Trust Bank, as Trustee for the Delta Airlines Master Trust

The Chase Manhattan Bank, as Trustee for the Boeing Company Employee Retirement
Plans Master Trust

Mellon Bank, N.A., as Trustee for the Bell Atlantic Master Trust

Boston Safe Deposit and Trust Company, as Trustee for the Kodak Retirement
Income Plan Trust

Boston Safe Deposit and Trust Company, as Trustee for the Eastman Retirement
Assistance Plan Trust

                                       14

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