| 1. |  | Illinois-Missouri, Thebes quadrangle | Maps; Topographic maps; Topography; Illinois; Thebes (Ill.); Missouri | 1 map : col.; Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army"; "Surveyed in 1927-1929 and 1931"; "Contour intervals... |
