Email Record: Letter from the President of the Board of Commissioners District of Columbia transmitting a joint report prepared by the District Engineer, United States Engineer Office, Washington, D. C., and the Engineer Commissioner, District of Columbia, with the accompanying papers and illustrations, in response to an item in the District of Columbia Appropriation Act of 1941 and 1942, "For the development of a plan to insure an adequate future water supply for the District of Columbia".