| 1. |  | Missouri-Illinois, Charleston quadrangle : grid zone 'C' | Illinois; Maps; Topographic maps; Topography; Charleston (Mo.); Missouri | 1 map : col.; Relief shown by contours and spot heights.; "Topography by Corps of Engineers...1930-39. Revised...1932, 1935 and 1939."; "Contour interval 5 feet." |
