Water Pollution 1967 (Part 1), Hearings before the Subcommittee on Air and Water Pollution, Senate Committee on Public Works, 90th Congress, on S. 1591 and S. 1604, July 7, 8, and 9, 1967; on S. 1870, July 13, 1967; and on S. 1341, August 7, 1967, pp. 1 495

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