Clean coal technologies : hearing before the Subcommittee on Energy and Power of the Committee on Energy and Commerce, House of Representatives, One Hundred First Congress, first session, April 13, 1989
Washington : U.S. Government Printing Office, 1989. Washington, DC : For sale by the Superintendent of Documents, Congressional Sales Office, U.S. Government Printing Office [Getzville, New York] : William S. Hein & Company, [2014]