1942. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1930 and 1935-1936.";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey Division (Urbana, Ill.), 1942. and U.S. Geological Survey (Washington, D.C.).
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1942. 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 1922, 1935 an... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).