| 1. |  | Colfax quadrangle, Illinois : 15 minute series | Illinois; Maps; Topographic maps; Topography; Colfax (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 1956. Topography by planetable surveys 1957." |
