Pollution of Navigable Waters: Hearings Before the Committee on Rivers and Harbors, House of Representatives, Seventy-fourth Congress, Second Session [i.e. Seventy-fifth Congress, First Session], on H.R. 2711, to Create a Division of Water Pollution Control in the United States Public Health Service, and for Other Purposes; H.R. 3419, to Prevent Pollution of the Navigable Waters of the United States and for Other Purposes. March 17, 18, 19, and 24, 1937