| 1. |  | Mendon quadrangle, Illinois-Missouri : 15 minute series (topographic). | Mendon; Missouri; Illinois; Maps; Topographic maps; Topography | 1 map : col.; Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods, 1946."; "Contour interval 20 feet."... |
