| 1. |  | Flanagan quadrangle, Illinois : 15 minute series (topographic) | Illinois; Maps; Topographic maps; Topography; Flanagan (Ill.) | 1 map : col.; Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1951. Topography by planetable surveys 1957-1958."; Contour interval 10 feet.... |
