1. No. 2 map of the Rock Island Rapids of the Mississippi River Maps University Of Minnesota Public content 1837. United States. Army. Corps of Engineers. Rock Island at left of map, Davensport Island rightmost labeled island.; Photocopy.; Relief shown by hachures.; "25th Cong., 2nd sess., Senate Doc.... W.J. Stone, Sc (Wash[ington] City [D.C).