Ohio River Pollution Control. Letter from the Acting Secretary of War Transmitting a Letter from the Chief of Engineers, United States Army, Dated May 4, 1943, Forwarding a Report, Together with Accompanying Papers and Illustrations, on a Survey of the Ohio River and Its Tributaries for Pollution Control, Authorized by Section 5 of the River and Harbor Act Approved August 26, 1937 in Two Parts (three Volumes). Part Two. Report of the United States Public Health Service