1930. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1927.";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.).
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1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1916.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma... Geological Survey (U.S.) and 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.) and Geological Survey Division (Urbana, Ill.).
1932. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1928-1929.";Relief shown by contours and spot heights.;Shows highway classification as of 1932.;Text and ill... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1943. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1928 and 1938-1939";Relief shown by contours and spot heights.;Shows roadway classification as of 1942.;1 ma... Geological Survey (U.S.) and 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.) and Geological Survey Division (Urbana, Ill.).
1937. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1921-1922 and 1931-1933.";Relief shown by contours and spot heights.;Shows roadway classification as of 1936... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1910. Geological Survey (U.S.). Surveyed in 1907-1908.;"Surveyed in cooperation with the State of Illinois."; (W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 39⁰00ʹ00ʺ--N 38⁰45ʹ00ʺ);Relief shown by c... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1925. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921 and 1923.";Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1925. Geological Survey (U.S.). (W 90⁰15ʹ00ʺ--W 90⁰00ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ);"Control in part by Illinois River Commission and Corps of Engineers U.S. Army.";"Surveyed in 1... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).