247 F.3d 574 (5th Cir. 2001) UNION PACIFIC RESOURCES GROUP, INC.; BIG ISLAND TRONA CO., Plaintiffs-Appellants,v.RHONE-POULENC, INC., Defendant-Appellee. No. 99-10326 UNITED STATES COURT OF APPEALS, FIFTH CIRCUIT April 5, 2001 [Copyrighted Material Omitted][Copyrighted Material Omitted] Appeal from the United States District Court for the Northern District of Texas Before GARWOOD, WIENER, and DENNIS, Circuit Judges. […]