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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1891. Geological Survey (U.S.). Contour interval 5 feet.;"Surveyed in 1889.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1901. Geological Survey (U.S.). Contour interval 5 feet.;"Surveyed in 1889, 1897 and 1899.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1899. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1897.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1937. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.";"Surveyed in 1934";Relief s... Geological Survey (U.S.).
1893. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1891.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1893. Geological Survey (U.S.). 1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1940. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1939.";Relief shown by contours and spot heights.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1892. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1890.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1893. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1891.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
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