Great Lakes Harbors Study - Interim Report on Calumet Harbor, Illinois and Indiana. Letter from the Secretary of the Army, Dated March 17, 1959, Submitting a Report, Together with Accompanying Papers and an Illustration, on a Great Lakes Harbors Study - Interim Report on Calumet Harbor, Illinois and Indiana, Requested by Resolutions of the Committees on Public Works, United States Senate and House of Representatives, Adopted May 18, 1956 and June 27, 1956