Document:

<PAGE>   1
                                                                  EXHIBIT 10.3.1

Schedule of Omitted Documents in the Form of Exhibit 10.3, Including Material
Detail in Which Such Documents Differ From Exhibit 10.3

1.       Stock Option Agreement, dated as of May 7, 2001, between Ladenburg
         Thalmann Financial Services Inc. and Howard M. Lorber.

2        Stock Option Agreement, dated as of May 7, 2001, between Ladenburg
         Thalmann Financial Services Inc. and Bennett S. LeBow.

3.       Stock Option Agreement, dated as of May 7, 2001, between Ladenburg
         Thalmann Financial Services Inc. and Phillip Frost, M.D.

4.       Stock Option Agreement, dated as of May 7, 2001, between Ladenburg
         Thalmann Financial Services Inc. and Henry C. Beinstein.

5.       Stock Option Agreement, dated as of May 7, 2001, between Ladenburg
         Thalmann Financial Services Inc. and Robert J. Eide.

         The form of the documents listed above does not differ in material
detail from the form of exhibit 10.3 except with respect to the identity of the
director.<PAGE>   1

                   **See Restrictive Legend on Reverse Side**

                       INCORPORATED UNDER THE LAWS OF THE

                                State of Georgia

                           AER Energy Resources, Inc.

               THIS CERTIFIES THAT FWAER II, L.P. is the owner of
      One Hundred Two Thousand Two Hundred Fifty (*102,250*) Shares of the
                    Series C Convertible Preferred Stock of
                           AER Energy Resources, Inc.

transferable only on the books of the Corporation by the holder hereof in person
or by attorney upon surrender of this Certificate properly endorsed.

In Witness Whereof, the said Corporation has caused the Certificate to be
signed by its duly authorized officers and its Corporate Seal to be hereunto
affixed.

                     As of this 12th day of June A.D. 2001

By: /s/ J. T. Moore                    By: /s/ Lawrence Tinker
   -----------------------------          -------------------------------------
    J. T. Moore                            Dr. Lawrence Tinker
    Secretary                              Vice President - Advanced Technology

<PAGE>   2

         THESE SECURITIES HAVE BEEN ISSUED OR SOLD IN RELIANCE ON PARAGRAPH
(13) OF CODE SECTION 10-5-9 OF THE "GEORGIA SECURITIES ACT OF 1973," OR OTHER
EXEMPTIONS FROM REGISTRATION OR PROVISIONS THEREUNDER, AND MAY NOT BE SOLD OR
TRANSFERRED EXCEPT IN A TRANSACTION WHICH IS EXEMPT FROM REGISTRATION UNDER
SUCH ACT OR PURSUANT TO AN EFFECTIVE REGISTRATION UNDER SUCH ACT. THE SHARES
EVIDENCED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR INVESTMENT AND WITHOUT A
VIEW TO, EFFECTING A DISTRIBUTION THEREOF AND HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT") OR ANY OTHER
STATE SECURITIES LAWS ("STATE ACTS") IN RELIANCE ON ONE OR MORE EXEMPTIONS
THEREUNDER AND MAY NOT BE SOLD OR TRANSFERRED EXCEPT IN TRANSACTIONS EXEMPT
FROM REGISTRATION UNDER THE SECURITIES ACT OR ANY APPLICABLE STATE ACTS OR
PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT THEREUNDER, AND THE CORPORATION
SHALL HAVE RECEIVED AN OPINION OF COUNSEL ACCEPTABLE TO IT (BOTH AS TO THE
OPINION AND SUCH COUNSEL) THAT AN EXEMPTION FROM REGISTRATION UNDER THE
SECURITIES ACT AND THE STATE ACTS IS AVAILABLE IN CONNECTION THEREWITH. THE
SALE, TRANSFER OR OTHER DISPOSITION OF THE SHARES EVIDENCED BY THIS CERTIFICATE
IS RESTRICTED PURSUANT TO THE PROVISIONS OF A SECURITIES PURCHASE AGREEMENT TO
WHICH THE CORPORATION IS A PARTY, A COPY OF WHICH MAY BE EXAMINED AT THE OFFICE
OF THE CORPORATION.

                                 [CERTIFICATE]

         For Value Received, _____ hereby sell, assign and transfer unto
_________________________________ _________________________________ Shares of
the Preferred Stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint ________________________________________
Attorney to transfer the said Stock on the books of the within named
Corporation with full power of substitution in the premises.

         Dated ______________________

         In presence of

  _______________________________________ ____________________________________

NOTICE. THE [copy illegible]<PAGE>   1
                                                                    EXHIBIT 10.6

                          SECURITIES PURCHASE AGREEMENT

         THIS IS A SECURITIES PURCHASE AGREEMENT (this "Agreement") by and
between the undersigned ("Purchaser"), and AER Energy Resources, Inc., a Georgia
corporation ("AER"), dated as of June 1, 2001, and by which Purchaser and AER,
in consideration of the agreements set forth below (the mutuality, adequacy and
sufficiency of which are hereby acknowledged), hereby agree as follows:

         1.       Agreement to Purchase and Sell. Upon the terms set forth in
this Agreement, Purchaser hereby agrees to purchase from AER and AER agrees to
sell to Purchaser (i) (A) 100,000 shares of AER's no par value Series C
Convertible Preferred Stock (the "Preferred Stock") and (B) 2,250 shares of
Preferred Stock (representing 50% of the transaction fee to be paid by AER to
Purchaser) (collectively, the shares to be issued by AER pursuant to clauses (A)
and (B) above shall be referred to as the "Shares") and (ii) a warrant to
purchase 982,891 shares of AER's no par value Common Stock (the "Warrant") in
the form attached hereto as Exhibit A. The aggregate purchase price for the
Shares and the Warrant shall be $1,000,000.

         2.       The Closing. The closing shall occur at 10:00 a.m. on June 12,
2001 (the "Closing") at the offices of Sutherland Asbill & Brennan LLP, 999
Peachtree Street, N.E., Atlanta, Georgia 30309-3996, or as the parties shall
otherwise agree. At the Closing, the following shall occur:

                  (a)      AER shall deliver to Purchaser (i) a duly completed
and executed share certificate in the name of Purchaser representing the Shares,
and (ii) a duly completed and executed Warrant.

                  (b)      Purchaser shall deliver to AER by wire transfer in
immediately available federal funds the aggregate purchase price of the Shares
and the Warrant (less $11,250 representing 50% of the transaction fee to be paid
by AER to Purchaser).

         3.       Representations and Warranties.

                  (a)      By AER. AER hereby represents and warrants to
Purchaser that:

                           (i)      AER is a duly incorporated and organized
Georgia corporation validly existing and in good standing under Georgia law;

                           (ii)     AER has the power and authority to issue the
Shares and the Warrant to Purchaser pursuant to this Agreement and to execute,
deliver and otherwise perform this Agreement, and without limiting the
foregoing, the Board of Directors of AER has authorized and approved the
execution, delivery and performance of this Agreement;

                           (iii)    the Shares, the AER Common Stock ("Common
Stock") issuable upon exercise of the Warrant (the "Warrant Shares") and the
Common Stock issuable upon conversion of the Shares (the "Conversion Shares")
when issued will be validly issued, fully paid and non-assessable shares of
capital stock of AER free and clear of any liens, encumbrances,

<PAGE>   2

adverse rights or claims of any kind whatsoever, and AER will at all times
maintain a number of authorized but unissued shares of Common Stock for issuance
of the Warrant Shares and the Conversion Shares;

                           (iv)     this Agreement and the Warrant each has been
duly executed and delivered by AER, and constitutes the legal, valid and binding
obligation of AER, enforceable in accordance with its terms, except as
enforceability may be limited by applicable bankruptcy, insolvency and other
laws and equitable principles affecting creditors' rights generally and the
discretion of the courts in granting equitable remedies;

                           (v)      the execution, delivery and performance of
this Agreement and the Warrant each is in compliance with, and is not and will
not be, after the giving of notice or the passage of time or both, in violation
of (A) the articles of incorporation or bylaws of AER as amended or restated,
(B) any applicable law, regulation or order to which AER or its assets is
subject or bound, or (C) any agreement to which AER or its assets is subject or
bound (and without limiting the foregoing, will not result in any preemptive
rights);

                           (vi)     all of the documents (the "SEC Documents")
filed by AER within the last thirty-six months prior to the date of this
Agreement with the Securities and Exchange Commission (the "Commission") in
accordance with the requirements of the Securities Act of 1933, as amended (the
"Securities Act"), and the Securities Exchange Act of 1934, as amended
(collectively the "Securities Acts"), conformed in all material respects to the
requirements of the Securities Acts and the rules and regulations of the
Commission thereunder, and none of such documents contained an untrue statement
of a material fact or omitted to state a material fact required to be stated
therein or necessary to make the statements therein not misleading;

                           (vii)    the authorized capital stock of AER consists
of 100,000,000 shares of common stock, no par value ("Common Stock") and
10,000,000 shares of preferred stock, no par value. As of June 1, 2001, AER had
25,850,263 shares of Common Stock outstanding, and 506,750 shares of preferred
stock outstanding. Other than warrants previously issued to Purchaser, Elmwood
Partners II (or their affiliates) and Rayovac Corporation, stock options granted
to employees, restricted stock issued to directors and AER's outstanding Series
A and Series B Convertible Preferred Stock, all as described in the SEC
Documents, AER has no outstanding securities convertible into (or exercisable or
exchangeable for) or evidencing the right to purchase or subscribe for, shares
of its capital stock or authorized subscriptions, options, warrants, calls,
rights, commitments or any other agreements or arrangements, obligating it to
issue any shares of its capital stock or securities convertible into capital
stock;

                           (viii)   the financial statements (including any
related notes) included in the SEC Documents (the "Financial Statements"), have
been prepared in accordance with generally accepted accounting principles
consistently applied throughout the periods involved (except as may be noted
therein) and fairly present the financial condition, results of operations and
cash flows of AER as of the dates thereof and for the periods ended on such
dates (in each case subject, as to interim statements, to changes resulting from
year-end adjustments (none of which were or could be expected to be material in
amount or effect)); and

                                      -2-
<PAGE>   3

                           (ix)     except as set forth in the Financial
Statements, since March 31, 2001, AER has conducted its business only in the
ordinary course in substantially the same manner as theretofore conducted, and
AER has not undergone or suffered any material adverse change in its condition,
financial or otherwise, business, operations, affairs, properties, assets or
prospects.

                  (b)      By Purchaser. Purchaser hereby represents and
warrants to AER:

                           (i)      this Agreement has been duly executed and
delivered by Purchaser, and constitutes the legal, valid and binding obligation
of Purchaser, enforceable in accordance with its terms, except as enforceability
may be limited by applicable bankruptcy, insolvency and other laws and equitable
principles affecting creditors' rights generally and the discretion of the
courts in granting equitable remedies;

                           (ii)     Purchaser will acquire the Shares, the
Conversion Shares, the Warrant and the Warrant Shares (collectively the
"Securities") for its own account, to hold for investment, and with no present
intention of dividing its participation with others or reselling or otherwise
participating, directly or indirectly, in a distribution of the Securities, and
it will not make any sale, transfer, or other disposition of the Securities in
violation of the Securities Act or any applicable state securities laws (the
"State Acts"). There will be placed on the Warrant and any certificates for the
Shares, the Conversion Shares and the Warrant Shares, a legend stating in
substance:

                           THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN
                           REGISTERED UNDER THE SECURITIES ACT OF 1933 AS
                           AMENDED (THE "SECURITIES ACT") OR ANY STATE
                           SECURITIES LAWS IN RELIANCE ON ONE OR MORE EXEMPTIONS
                           THEREUNDER AND MAY NOT BE SOLD OR TRANSFERRED EXCEPT
                           IN TRANSACTIONS EXEMPT FROM REGISTRATION UNDER THE
                           SECURITIES ACT OR ANY APPLICABLE STATE SECURITIES
                           LAWS OR PURSUANT TO AN EFFECTIVE REGISTRATION
                           STATEMENT THEREUNDER. THE SECURITIES EVIDENCED HEREBY
                           ARE SUBJECT TO RESTRICTIONS ON TRANSFER CONTAINED IN
                           A SECURITIES PURCHASE AGREEMENT TO WHICH THE
                           CORPORATION IS A PARTY. ANY TRANSFER OF THE
                           SECURITIES REPRESENTED HEREBY IN VIOLATION OF SAID
                           AGREEMENT SHALL BE VOID. THE CORPORATION WILL MAIL TO
                           THE HOLDER OF THESE SECURITIES A COPY OF SUCH
                           RESTRICTIONS WITHOUT CHARGE WITHIN FIVE (5) DAYS
                           AFTER RECEIPT OF WRITTEN REQUEST THEREFOR ADDRESSED
                           TO THE CORPORATION.

                                      -3-
<PAGE>   4

                           (iii)    Purchaser, in offering to subscribe for the
Securities hereunder, has been given access to all material and relevant
information concerning AER, thereby enabling Purchaser to make an informed
investment decision concerning the Securities. Purchaser has relied solely upon
an independent investigation made by it and its representatives, if any, and
has, prior to the date hereof, been given access to and the opportunity to
examine data and information relating to AER. In making its investment decision
to purchase the Securities, Purchaser is not relying on any oral or written
representations or assurances from AER or any other person or any representation
of AER or any other person other than as set forth in this Agreement. Without
limiting the foregoing, Purchaser has reviewed AER's Annual Report on Form 10-K
for the year ended December 31, 2000 and AER's Quarterly Report on Form 10-Q for
the quarter ended March 31, 2001. Purchaser is an "accredited investor" as
defined in Rule 501 of Regulation D under the Securities Act.

                           (iv)     Purchaser understands and acknowledges that
an investment in the Securities involves a high degree of risk. Purchaser
represents that Purchaser is able to bear the economic risk of an investment in
the Securities, which Purchaser acknowledges are currently illiquid and may
remain illiquid indefinitely, including a possible total loss of its investment.
In making this statement Purchaser hereby represents and warrants to AER that
Purchaser has adequate means of providing for Purchaser's current needs and
contingencies; Purchaser is able to afford to hold the Securities for an
indefinite period and Purchaser further represents that Purchaser has such
knowledge and experience in financial and business matters that Purchaser is
capable of evaluating the merits and risks of the investment in the Securities.
Further, Purchaser represents that Purchaser has no present need for liquidity
in the Securities and Purchaser is willing to accept such investment risks.

                           (v)      Purchaser understands that no United States
federal or state agency, or similar agency of any other country, has reviewed,
approved, passed upon or made any recommendation or endorsement of AER or the
Securities.

                           (vi)     This Agreement is made by AER with Purchaser
in reliance upon Purchaser's representations and covenants made in this Section
3(b), which reliance by its execution of this Agreement Purchaser hereby
confirms.

                           (vii)    Purchaser understands that the Securities
have not been registered under the Securities Act or any State Acts and are
being offered and sold pursuant to exemptions therefrom based in part upon the
representations of Purchaser contained herein.

                           (viii)   Purchaser knows of no public solicitation or
advertisement of an offer in connection with the proposed issuance and sale of
the Securities.

                           (ix)     Purchaser has reviewed with its tax advisors
the U.S. federal, state, local and foreign tax consequences of an investment in
the Securities and the transactions contemplated by this Agreement. Purchaser is
relying solely on such advisors and not on any statements or representations of
AER or any of its agents and understands that Purchaser (and not AER) shall be
responsible for Purchaser's own tax liability that may arise as a result of this
investment or the transactions contemplated by this Agreement.

                                      -4-
<PAGE>   5

                           (x)      Purchaser's acquisition of the Securities is
not a transaction (or any element of a series of transactions) that is a part of
a plan or scheme to evade the registration provisions of the Securities Act.

         4.       Registration of Shares.

                  (a)      Demand Registration. If at any time prior to eight
(8) years from the date of the Closing, AER shall receive a written request from
Purchaser who is then holding Shares, Conversion Shares, the Warrant and Warrant
Shares representing at least 25% of the Common Stock issuable upon conversion of
the Shares or exercise of the Warrant that AER file a registration statement
under the Securities Act, covering the registration of at least $500,000 of
shares of Common Stock owned by Purchaser, Keystone, Inc., David G. Brown, Mark
A. Wolfson or "affiliates" or "associates" thereof, as such terms are defined in
the Securities Act (collectively, the "Third Party Shareholders") to the extent
such shares of Common Stock are not then freely tradable under the Securities
Act. Purchaser and any Third Party Shareholder shall have ten (10) days in which
to notify AER of its intention to join in the request to register its shares.
Not later than ninety (90) days after receipt by AER of a written request for a
demand registration pursuant to this Section 4(a), AER shall file a registration
statement with the Commission relating to the shares as to which such request
for a demand registration relates (the "Requested Shares") and AER shall use its
best efforts to cause the registration statement (which may cover, without
limitation, an offering on a delayed or continuous basis open for up to one
hundred eighty (180) days pursuant to Commission Rule 415) for the Requested
Shares to become effective under the Securities Act. AER shall be obligated to
effect only three (3) registrations pursuant to this Section 4(a) for Purchaser
and the Third Party Shareholders together, and only if the proposed aggregate
selling price in any such offering is at least $500,000.

                  (b)      Delay of Registration. Notwithstanding anything to
the contrary in Section 4(a), AER shall have the right (i) to defer the initial
filing or request for acceleration of effectiveness of any registration pursuant
to Section 4(a) or (ii) after effectiveness, to suspend effectiveness of any
such registration statement or to require holders to suspend further sales
pending amendment (collectively a "Delay"), if, in the good faith judgment of
the Board of Directors of AER and upon the advice of counsel to AER, such delay
in filing or requesting acceleration of effectiveness or such suspension of
effectiveness or suspension of sales is necessary in light of the existence of
material non-public information (financial or otherwise) concerning AER
disclosure of which at the time is not, in the opinion of the Board of Directors
of AER and upon the advice of counsel, (A) otherwise required and (B) in the
best interests of AER; provided, however that AER will not invoke a Delay for
more than three (3) months, unless the reason for the Delay is that AER is then
engaged in an acquisition, in which case it will use its best efforts to end the
Delay as soon as possible and provided, further that AER will not invoke Delays
for more than an aggregate of six (6) months in any calendar year. The one
hundred eighty (180) day period referred to herein during which the registration
statement may be kept current after its effective date shall be extended for an
additional number of business days equal to the number of business days during
which the right to sell shares was suspended pursuant to the preceding sentence,
and, if and to the extent necessary to effect such extension,

                                      -5-
<PAGE>   6

the eight (8)-year period referred to above shall also be extended. In addition,
the eight (8)-year period will also be extended if any registration has been
delayed pursuant to the foregoing and cannot be completed within such period.

                  (c)      "Piggyback" Registration. If at any time prior to
eight (8) years from the date of the Closing, AER shall determine to proceed
with the preparation and filing of a registration statement under the Securities
Act in connection with the proposed offer and sale for money of any of its
equity securities by it or any of its security holders (other than on Form S-4
or Form S-8 promulgated under the Securities Act or any successor or similar
form), AER will give written notice of its determination to Purchaser. Upon the
written request of Purchaser or any Third Party Shareholder given to AER within
ten (10) days after Purchaser's receipt of any such notice by AER, AER will
cause all the Conversion Shares and Warrant Shares and other shares of Common
Stock which Purchaser and any of the Third Party Shareholders have requested to
have registered (the "Piggyback Shares") to be included in such registration
statement; provided, however, that if the managing underwriter, in the case of
an underwritten public offering, determines and advises in writing that the
inclusion in the registration statement of all the Piggyback Shares proposed to
be included by Purchaser or the Third Party Shareholders would interfere with
the successful marketing of the securities proposed to be registered by AER,
then the number of such Piggyback Shares to be included in the registration
statement shall be reduced in accordance with the recommendations of the
managing underwriter, except that if the managing underwriter determines and
advises that the inclusion in such registration statement of any Piggyback
Shares would so interfere, then no Piggyback Shares shall be included in such
registration statement; provided that any such reduction shall be made pro rata
with respect to Purchaser and the Third Party Shareholders requesting such
registration.

                  (d)      Expenses. With respect to each inclusion of shares in
a registration statement pursuant to Section 4(a) or 4(b), AER shall bear the
following fees, costs and expenses: all registration, filing and NASD fees,
printing expenses, fees and disbursements of counsel and accountants for AER and
all legal fees and disbursements and other expenses of complying with state
securities or blue sky laws of any jurisdictions in which the securities to be
offered are to be registered or qualified. Fees and disbursements not expressly
included above shall be borne pro rata by Purchaser and the Third Party
Shareholders whose shares are included in such registration statement.

                  (e)      Indemnification, Etc. In the event that shares are
registered pursuant to Section 4(a) or 4(b), AER, Purchaser and the Third Party
Shareholders shall execute reasonable and customary underwriting,
indemnification and lock-up agreements relating to such registration and shall
undertake reasonable and customary registration procedures.

                  (f)      Termination of Rights. Notwithstanding anything to
the contrary in this Section 4, all registration rights set forth in this
Section 4 shall terminate with respect to Purchaser and each Third Party
Shareholder at such time as it or he is able to sell all of its or his Common
Stock subject to such registration rights pursuant to Rule 144 under the
Securities Act within a single three (3)-month period.

                                      -6-
<PAGE>   7

         5.       Survival; Indemnification. The representations, warranties and
agreements made in this Agreement shall survive the Closing. Each party,
acknowledging that the other is entitled to rely on its representations,
warranties and agreements in this Agreement in order to preserve the benefit of
the bargain otherwise represented by this Agreement, agrees that neither the
survival of such representations, warranties and agreements, nor their
enforceability nor any remedies for breaches of them shall be affected by any
knowledge of a party regardless of when or how such party acquired such
knowledge.

         6.       Miscellaneous.

                  (a)      Good Faith Efforts; Further Assurances; Cooperation.
The parties shall in good faith undertake to perform their obligations in this
Agreement, to satisfy all conditions and to cause the transactions contemplated
in this Agreement to be carried out promptly in accordance with the terms of
this Agreement. Upon the execution of this Agreement and thereafter, each party
shall do such things as may be reasonably requested by the other in order more
effectively to consummate or document the transactions contemplated by this
Agreement. The parties shall cooperate with each other and their respective
counsel, accountants or representatives in connection with any actions required
to be taken as part of their respective rights and obligations under this
Agreement.

                  (b)      Notices. Each notice, communication and delivery
under this Agreement (i) shall be made in writing signed by the party making the
same, (ii) shall specify the section of this Agreement pursuant to which it is
given, (iii) shall be given either in person or by a nationally recognized next
business day delivery service or by telecopier, and (iv) if not given in person,
shall be given to a party at the address set forth below such party's signature
(or at such other address as a party may furnish to the other party to this
Agreement pursuant to this Section 6(b)). If notice is given pursuant to this
Section 6(b) of a permitted successor or assign of a party, then notice shall
also thereafter be given as set forth above to such successor or assign of such
party.

                  (c)      Assignment. No assignment or transfer by Purchaser or
any Third Party Shareholder of their respective rights and obligations under
this Agreement shall be made by merger or other operation of law or otherwise
except with the prior written consent of AER. This Agreement is binding upon the
parties and their successors and assigns and inures to the benefit of the
parties and their permitted successors and assigns and, when appropriate to
effect the binding nature of this Agreement for the benefit of the other
parties, of any other successor or assign.

                  (d)      Severability. Any determination by any court of
competent jurisdiction of the invalidity of any provision of this Agreement that
is not essential for accomplishing its purposes shall not affect the validity of
any other provision of this Agreement, which shall remain in full force and
effect and which shall be construed as to be valid under applicable law.

                  (e)      Controlling Law; Integration; Amendment; Waiver. This
Agreement is governed by, and shall be construed and enforced in accordance
with, the laws of the State of Georgia (except the laws of that state that would
render such choice of laws ineffective). This

                                      -7-
<PAGE>   8

Agreement supersedes all prior negotiations, agreements and understandings
between the parties as to its subject matter, constitutes the entire agreement
between the parties as to its subject matter and may not be altered or amended
except in writing signed by the parties. The failure of any party at any time or
times to require performance of any provision of this Agreement shall in no
manner affect the right to enforce the same; and no waiver by any party of any
provision or of a breach of any provision of this Agreement, whether by conduct
or otherwise, in any one of more instances shall be deemed or construed either
as a further or continuing waiver of any such provision or breach or as a waiver
of any other provision or of a breach of any other provision of this Agreement.

                  (f)      Copies. This Agreement may be executed in two or more
copies, each of which shall be deemed an original, and it shall not be necessary
in making proof of this Agreement or its terms to produce or account for more
than one of such copies.

                   [signatures commence on the following page]

                                      -8-
<PAGE>   9

         DULY EXECUTED and delivered by Purchaser and AER, on June 1, 2001.

PURCHASER:                       FW AER II, L.P.
---------

                                 By:     /s/    Kevin F. Levy
                                    --------------------------------------------
                                      Kevin F. Levy
                                      Vice President of Group 31, Inc.,
                                      General Partner

                                 Address:
                                 201 Main Street, Suite 3100
                                 Fort Worth, Texas 76102
                                 Phone:       (817) 390-8500
                                 Fax Number:  (817) 338-2064

AER:                             AER ENERGY RESOURCES, INC.
---

                                 By:     /s/    J. T. Moore
                                    --------------------------------------------
                                      J.T. Moore
                                      Vice President and Chief Financial Officer

                                 Address:
                                 4600 Highlands Parkway, Suite G
                                 Smyrna, Georgia  30082
                                 Phone:       (770) 433-2127
                                 Fax Number:  (770) 433-2286

                                    * * * * *

                                      -9-

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