Conference, pollution of interstate waters of Grand Calumet River, Little Calumet River, Calumet River, Wolf Lake, Lake Michigan, and their tributaries, Ind.-Ill., proceedings, 2d session, Nov. 7, 1968, Dec. 11-12, 1968, Jan. 29, 1969; reconvened Aug. 26, 1969, Chicago, Ill.

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