EXHIBIT 99.1


                  Certification of Periodic Financial Reports

The undersigned officer of Range Resources Corporation or its subsidiaries, does
hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)     the Annual Report on Form 11-K for the fiscal year ended December 31,
        2002 (the "Periodic Report") of the Range Resources Corporation 401(K)
        Plan (the "Plan") which this statement accompanies fully complies with
        the requirements of Section 13(a) or 15(d) of the Securities Exchange
        Act of 1934 (15 U.S.C. 78m or 78o(d); and

(2)     information contained in the Periodic Report fairly presents, in all
        material respects, the financial condition and results of operations of
        the Plan.


Dated: June 26, 20036

                                                        /s/ Rodney L. Waller
                                                        -----------------------
                                                        Rodney L. Waller
                                                        Senior Vice President


                                      F-15