1940. Geological Survey (U.S.). Surveyed in 1930 and 1935.;Relief shown by contours and spot heights.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1915. Geological Survey (U.S.). Surveyed in 1911 and 1913.;Relief shown by contours and spot heights.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).