1908. Geological Survey (U.S.). Relief shown by contours and spot heights on region map.; Battlefield map is intended to show the field as it was at or about the time of the battl... The Survey (Washington, D.C).
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1908. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1906.";"Surveyed in cooperation with the State of Illinois.;Relief indicated by contours and spot heights.;1... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1908. 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. U.S. Geological Survey (U.S.).
1908. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1906.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1908. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1906.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1908. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1890.";Relief shown by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1908. Geological Survey (U.S.). Relief shown by contours and spot heights. 51 x 36 Centimeters Scale 1:500,000 ; General Map Collection. The Survey (Washington).