1952. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939 and 1941. Topography by plane-table surveys 195... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1952. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-table surveys 1951."; (W 8... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1952. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1940. Topography by plane-table surveys 1930 and 195... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1952. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-table methods 1930 and 195... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1952. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1951. Topography by plane-table surveys 1952";Relief... Geological Survey (U.S.).