1929. Geological Survey (U.S.). Relief shown by contours and spot heights.;"Surveyed in 1925-1926.";Contour interval 20 feet;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey Division (Urbana, Ill.) and Geological Survey (U.S.).
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1929. Geological Survey (U.S.). Contour interval 20 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1926";Relief s... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Kentucky Geological Survey (Lexington, Ky.).
1929. Geological Survey (U.S.). Contour interval 20 feet.;"Illinos culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1926";... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Kentucky Geological Survey (Lexington, Ky.).