Inland waterways. Intracoastal waterway, Mobile Bay, Ala., to New Orleans La., report on preliminary examination and survey of Mobile Bay-New Orleans section of inland waterway from New Orleans, La., to Apalachicola River, Fla., and Apalachicola and Chattahoochee rivers to Columbus, Ga., with view to securing depth suitable to economical operation of self-propelled barges.