| 1. |  | Illinois-Indiana, Carmi quadrangle : 15-minute series | Illinois; Maps; Topographic maps; Topography; Carmi; Indiana | 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1921 and 1939-1940."; "Topography in Indiana from chart of the Wabash River by Corps of Engineers, U.S. Army."; "Contour interval... |
