Mississippi River and tributaries in the County of Aitkin, Minn., and between Sandy Lake and Brainerd, Minn. Letter from the Secretary of the Army transmitting a letter from the Chief of Engineers, United States Army, dated July 21, 1947, submitting a report, together with accompanying papers and illustrations, on a preliminary examination and survey of the Mississippi River and tributaries in the County of Aitkin, Minn., authorized by the Flood Control Act approved on December 22, 1944, and a review of report on the Mississippi River between Sandy Lake and Brainerd, Minn., requested by a resolution of the Committee on Commerce of the United States Senate, adopted on August 8, 1944.