| 1. |  | Assumption quadrangle, Illinois : 15 minute series (topographic) | Illinois; Maps; Topographic maps; Topography; Assumption (Ill.) | 1 map : col.; Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1950. Topography by plane-table surveys 1945 and 1951-1952."; Includes quadrangle... |
