1915. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1912-1913.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours.;1 map, colored;4... Geological Survey (U.S.) and State Geological Survey (Urbana, Ill.).
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1915. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1911 and 1913.";"Surveyed in cooperation with the States of Missouri and Illinois.";Relief shown by contours... Bureau of Geology and Mines (Rolla, Mo.), Geological Survey (U.S.), and Geological Survey Division (Urbana, Ill.).
1915. United States. Bureau of Chemistry and Soils. Relief shown by contours.; Shows distribution of soil types by colors and symbols. 58 x 82 centimeters Scale approximately 1:63,360; 1 inch = 1 mil... U.S. Bureau of Soils (Washington, D.C).