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EXHIBIT 99.4
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(f) under the Securities Exchange Act of
1934, as amended, the undersigned hereby agree to the joint filing with each
other of the attached statement on Schedule 13D and to all amendments to such
statement and that such statement and all amendments to such statement are made
on behalf of each of them.
IN WITNESS WHEREOF, the undersigned hereby execute this agreement on
June 27, 2000.
Chesapeake Energy Corporation, an Oklahoma
corporation
By /s/ Aubrey K. McClendon
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Aubrey K. McClendon, Chief Executive Officer
Chesapeake Exploration Limited Partnership, an
Oklahoma limited partnership
By Chesapeake Operating, Inc., an Oklahoma
corporation, as general partner
By /s/ Aubrey K. McClendon
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Aubrey K.McClendon
Chief Executive Officer
Chesapeake Energy Marketing, Inc., an Oklahoma
corporation
By /s/ Aubrey K. McClendon
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Aubrey K. McClendon, Chief Executive Officer
