Alabama-Coosa branch of the Mobile River system (determination of salinity line in Mobile River and its tributaries). Letter from the Secretary of the Army transmitting a letter from the Chief of Engineers, United States Army, dated January 15, 1947, submitting a report, together with accompanying papers and illustrations, on a review of reports on Alabama-Coosa branch of the Mobile River System, with a view to locating as nearly as can be determined the salinity line in the Mobile River and its tributaries, requested by a resolution of the Committee on Rivers and Harbors, House of Representatives, adopted on October 16, 1944.