United Technologies Corporation, Pratt & Whitney Group v. U.S. Environmental Protection Agency, American Petroleum Institute, American Iron and Steel Institute, Edison Electric Institute, Chemical Manufacturers Association, Intervenors. Environmental Defense Fund, Inc. v. Lee M. Thomas, Administrator and U.S. Environmental Protection Agency, American Petroleum Institute, American Iron and Steel Institute, Edison Electric Institute, Chemical Manufacturers Association, Intervenors. American Petroleum Institute v. U.S. Environmental Protection Agency, Edison Electric Institute, American Iron and Steel Institute, Intervenors. American Iron and Steel Institute v. Lee M. Thomas, Administrator and U.S. Environmental Protection Agency, American Petroleum Institute, Edison Electric Institute, Chemical Manufacturers Association, Intervenors. Motor Vehicle Manufacturers Association of the United States, Inc. v. Lee M. Thomas, Administrator and U.S. Environmental Protection Agency, American Petroleum Institute, American Iron and Steel Institute, Edison Electric Institute, Chemical Manufacturers Association, Intervenors. Edison Electric Institute v. U.S. Environmental Protection Agency, American Petroleum Institute, American Iron and Steel Institute, Chemical Manufacturers Association, Delmarva Power and Light Company, IntervenorsFiledJun 23, 1987