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
ene 1973 · U.S. Government Printing Office