Special Urban Air Pollution Problems, Denver and Houston: Hearings Before the Subcommittee on the Environment and the Atmosphere of the Committee on Science and Technology, U.S. House of Representatives, Ninety-fifth Congress, First Session, November 19, 21, 1977
United States. Congress. House. Committee on Science and Technology. Subcommittee on the Environment and the Atmosphere
Jan 1973 ยท U.S. Government Printing Office