| 1. |  | Effingham quadrangle, Illinois : 15 minute series (topographic) | Illinois; Maps; Topographic maps; Topography; Effingham (Ill.) | 1 map : col.; Relief shown by contours and spot heights.; "Contour interval 10 feet"; "Culture and drainage in part compiled from aerial photographs taken 1938-1939. Topography by plane-table methods 1949-1950."... |
