Letter from the Secretary of War transmitting a letter from the Chief of Engineers, United States Army, dated March 8, 1946, submitting a report, together with accompanying papers and illustrations, on a preliminary examination and survey of the Potomac River and tributaries, Maryland, Virginia, West Virginia, and Pennsylvania, including the North Branch of the Potomac River and its tributaries in the vicinity of Keyser, W. Va., authorized by the Flood Control Acts approved on June 22, 1936 and August 28, 1937, and an Act of Congress approved on May 5, 1936.