| 1. |  | Villa Grove quadrangle, Illinois : 15 minute series (topographic) | Maps; Topographic maps; Topography; Illinois; Villa Grove (Ill.) | 1 map : col.; Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1953-1954. Topography by planetable surveys, 1956."; "Contour interval 10... |
