1958. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken 1956. Topography by planetable surveys 1957.";Relief ... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1958. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken 1951. Topography by planetable surveys 1957-1958.;Contour interval 10 feet.;Rel... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1958. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1919-1920, in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 map, col... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1958. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1922-1923";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey Division (Urbana, Ill.) and U.S. Geological Survey (U.S.).
1958. Geological Survey (U.S.). Contour interval 20 feet.;"Mapped by the Geological Survey 1928, 1935 and 1942";Relief shown by contours and spot heights.;1 map, colored;45 x 35 c... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1958. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1939-1941";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1958. Geological Survey (U.S.). Contour interval 10 feet.;"Topography from aerial photographs by Kelsh plotter and by planetable surveys 1957. Aerial photographs taken 1956.";Reli... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1958. Geological Survey (U.S.). Contour interval 10 feet.;"Topography from aerial photographs by Kelsh plotter and by planetable surveys 1956-1957. Aerial photographs taken 1956."... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1958. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1954. Topography by planetable surveys 1924, Revised... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).