| 1. |  | Stewardson quadrangle, Illinois : 15 minute series (topographic) | Maps; Topographic maps; Topography; Illinois; Stewardson (Ill.) | 1 map : col.; Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-table methods 1935 and 1947"; "Contour interval... |
