Anna Maria and Longboat Keys, Fla., beach erosion study. Letter from the Secretary of the Army transmitting a letter from the Chief of Engineers, United States Army, dated October 9, 1947, submitting a report, together with accompanying papers and illustrations, on a cooperative beach erosion study of Anna Maria and Longboat Keys, Fla., made under the provisions of section 2 of the River and Harbor Act approved on July 3, 1930, as amended and supplemented.