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Senate Hearing, 89th Congress - Air pollution control: hearings before a Special Subcommittee on Air and Water Pollution of the Committee on Public Works, United States Senate, Eighty-ninth Congress, first session, on S. 306, a bill to amend the Clean air act to require standards for controlling the emission of pollutants from gasoline-powered or diesel-powered vehicles, to establish a federal air pollution control laboratory, and for other purposes, April 7, 1965.