1926. Geological Survey (U.S.). Surveyed in 1922-1923-1924.;Relief shown by contours and spot heights.;Road classification "Mar. 1926.";1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).
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1926. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1924";Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500. Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).
1926. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1924";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).
1926. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921 and 1924";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).
1926. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921 and 1924";Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500. Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).
1926. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1922 and 1924.";Relief shown by contours and spot heights.;Shows roadway classification as of Oct., 1925.;Te... Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).
1926. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921 and 1924.";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).