"Water analysis." . . . . . . . . "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"@en . . . . . . . . . "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 asurvey of the Ohio river and its tributaries for pollution control, authorized by section 5 of the River and harbor act, approved August 26, 1937" . . . "Ohio River." . . "Ohio River" . . .