Estimate of cost of examinations, etc., of streams where power development appears feasible. Letter from the Secretary of War transmitting a letter from the Chief of Engineers, U. S. Army, and the Secretary of the Federal Power Commission, showing all navigable streams upon which power development appears to be feasible and the estimate of cost of examinations of the same submitted in accordance with the requirements of section 3 of the River and Harbor Act of March 3, 1925.