Acid rain : hearing before the Subcommittee on Arms Control, Oceans, International Operations and En

United States. Congress. Senate. Committee on Foreign Relations. Subcommittee on Arms Control, Oceans, International Operations, and Environment.
Washington : U.S. G.P.O., 1982.

United States-Canadian relations and acid rain : hearing before the Subcommittee on Human Rights and

United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Human Rights and International Organizations.
Washington : U.S. G.P.O., 1981.