Letter from the Secretary of War transmitting a letter from the Chief of Engineers, United States Army, dated May 8, 1946, submitting a report, together with accompanying papers and illustrations, on a preliminary examination and survey of San Diego River and Mission Bay, San Diego County, Calif., with a view to improvement for flood control and navigation, Authorized by the Flood Control Acts approved on May 6, 1936, June 22, 1936, and August 18, 1941, and the River and Harbor Act approved on March 2, 1945.