Exhibit 99.1




                             JOINT FILING AGREEMENT


     In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934,
as amended, the undersigned hereby agree that the attached Schedule 13D is filed
on behalf of each of them.  The  undersigned  agree to the joint  filing of such
Schedule 13D and all amendments thereto and further agree as follows:

     Each of the  undersigned  is  responsible  for the  timely  filing  of such
Schedule 13D and any amendments  thereto,  and for the completeness and accuracy
of the information  concerning such person contained therein; but neither of the
undersigned is responsible  for the  completeness or accuracy of the information
concerning  the other person  executing this joint filing  agreement,  unless he
knows or has reason to believe that such information concerning the other person
is inaccurate.

        IN WITNESS WHEREOF, the undersigned hereby execute this agreement on
June 9, 2003.



                                             /s/ Aubrey K. McClendon
                                             ----------------------------------
                                             AUBREY K. McCLENDON, an individual



                                             /s/ Tom L. Ward
                                             ----------------------------------
                                             TOM L. WARD, an individual