1910. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;Surveyed in 1908.;1 ... Geological Survey (U.S.).
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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.).
1910. Geological Survey (U.S.). Surveyed in 1908.;"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;1 map, colored;45 x 36 cm.;1... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1910. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1908.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and Geological Survey (Urbana, Ill.).
1910. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1908.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and State Geological Survey (Urbana, Ill.).