Letter from the Secretary of the Army Transmitting a Letter from the Chief of Engineers, Department of the Army, Dated April 30, 1962, Submitting a Report, Together with Accompanying Papers and an Illustration, on the Great Lakes Harbors Study -- Interim Report on the Muskegon Harbor, Michigan, Requested by Resolutions of the Committees on Public Works, United States Senate and House of Representatives, Adopted May 18, 1956, and June 27, 1956