Great Lakes Harbors Study--Interim Report on Detroit River, Trenton Channel, Mich.: Letter from the Secretary of the Army Transmitting a Letter from the Chief of Engineers, Dept. of the Army, Dated December 29, 1959, Submitting a Report...requested by the Resolutions of the Committees on Public Works, United States Senate and House of Representatives, Adopted May 18, 1956, June 27, 1956, and July 29, 1955, Respectively