1944. Geological Survey (U.S.). Road classification as of 1943.;"Contour interval 10 feet";"Surveyed in 1921 and 1941";Relief shown by contours and spot heights.;1 map, colored;45... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1944. Geological Survey (U.S.). Road classification as of 1943.;Relief shown by contours and spot heights.;"Surveyed in 1930-1931 and 1940.";Contour interval 10 feet.;1 map, color... Geological Survey Division (Urbana, Ill.) and Geological Survey (U.S.).
1944. Geological Survey (U.S.). Surveyed in 1930 and 1942;Relief shown by contours and spot heights.;Contour interval 20 feet.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1944. Geological Survey (U.S.). Contour interval 20 feet;"Surveyed in 1939, 1940, and 1942";Relief shown by contours and spot heights.;Road classification as of 1943.;1 map, color... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1944. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1936 and 1937.";Relief shown by contours.;Shows roadway classification as of 1943.;1 map, colored;45 x 35 cm... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1944. Geological Survey (U.S.). Contour interval 20 feet.;Relief shown by contours and spot heights.;Road classification as of 1944.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).