Letter from the Secretary of the Army transmitting a letter from the Chief of Engineers, Department of the Army, dated September 28, 1956, submitting a report, together with accompanying papers and an illustration, on a review of reports on San Juan Harbor, P.R., requested by resolutions of the Committee on Rivers and Harbors and the Committee on Public Works, House of Representatives, adopted December 21, 1945, and March 30, 1955, respectively.