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, no. 95-52
x, 675 pages : illustrations ; 24 cm
4653601
"No. 52."
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