United States. Army. Corps of EngineersRock Island at left of map, Davensport Island rightmost labeled island.; Photocopy.; Relief shown by hachures.; "25th Cong., 2nd sess., Senate Doc. no. 139"--upper right within neat line.; "Courtesy of the Army Corps of Engineers, Rock Island Aresenal, 1/80"--lower right outside neat line.25 x 85 centimetersJPEGUMN_ALMA:9949149310001701engW.J. Stone, Sc (Wash[ington] City [D.C)PublicNo. 2 map of the Rock Island Rapids of the Mississippi RiverMapsUnited States1837University of Minnesota