| 1. |  | Missouri-Illinois, Hannibal quadrangle | Illinois; Maps; Topographic maps; Topography; Hannibal (Mo.); Missouri | 1 map : col.; Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army."; "Surveyed in 1921 and 1928."; "Contour interval... |
