Water Pollution. Pollution of navigable waters, hearings, 76th Congress, 1st session, on H. R. 295, H. R. 922, and H. R. 2890, bills to create Division of Water Pollution Control in Public Health Service, and for other purposes, H. R. 4170, to prevent pollution of navigable waters of United States, H. R. 4314, to provide Federal aid to States in control of water pollution, to create Division of Water Pollution Control in Public Health Service, and for other purposes. Mar. 3 and 6, 1939.