Clean Air Act oversight--1973. hearings before the Subcommittee on Public Health and Environment of the Committee on Interstate and Foreign Commerce, House of Representatives, Ninety-Third Congress, first session on a review of the implementation of various provisions of the Clean Air Act of 1970. Part 1, September 10, 11, 12, 13, 14, 17, 18, 19, 20, and 21, 1973 :

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