1957. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken 1953. Topography by planetable surveys 1955-1956.;Contour interval 20 feet.;Rel... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1957. Geological Survey (U.S.). Topography in Illinois from aerial photographs by Kelsh plotter, Aerial photographs taken 1956. Field check 1957, Topography in Indiana by planetab... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Indiana Dept. of Conservation (Indianapolis, Ind.).
1957. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1931-1932";Rel... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1957. Geological Survey (U.S.). 1 map, colored;Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1953-1954. Topography by planetable s... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).