1. Maps. Mississippi River. Alluvial valley of Mississippi River; [map]. Scale 1:500,-000. Edition 1985. Engineer Reproduction Plant, Army, Fort Humphreys, D. C. Bookmark Corporate/Agency Authors: Mississippi River Commission, Engineer Department, and Veterans' Administration Publisher: Mississippi River Commission Date: 1935 SuDoc number: W 31.7:Al 5/2/N, S/935