Union Pacific Resources Company v. Federal Energy Regulatory Commission, Amoco Production Company, Undersigned Producers, Arkla Exploration Company, Conoco, Inc., Exxon Corporation, Coastal Gas Marketing Company, Colorado Interstate Gas Company, Natural Gas Pipeline Company of America, Intervenors. Ashland Exploration, Inc. v. Federal Energy Regulatory Commission, Undersigned Producers, Arkla Exploration Company, Exxon Corporation, Coastal Gas Marketing Company, Colorado Interstate Gas Company, Natural Gas Pipeline Company of America, IntervenorsFiledJun 25, 1991