| 2. ||Cullom quadrangle, Illinois-Livingston Co. : 15 minute series (topographic) ||Illinois; Maps; Topographic maps; Topography; Cullom (Ill.); Livingston County (Ill.) ||Relief shown by contours and spot heights. -- "Culture and drainage in part compiled from aerial photographs taken 1940. Topography by plane-table methods, 1947."; "Contour interval 10 feet."