Great Lakes Harbors Study, Interim Report on Alpena Harbor, Michigan: Letter from the Secretary of the Army Transmitting a Letter from the Chief of Engineers, Department of the Army, Dated March 5, 1963, Submitting a Report, Together with Accompanying Papers and an Illustration, on the Great Lakes Harbors Study -- Interim Report on the Alpena 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