1924. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1922.";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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1924. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921-1922"; (W 89⁰30ʹ00ʺ--W 89⁰15ʹ00ʺ/N 42⁰15ʹ00ʺ--N 42⁰00ʹ00ʺ);Relief shown by contours and spot heights.;1... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1924. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1922.";Relief shown by contours and spot heights.;1 map, colored;54 x 44 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1924. Geological Survey (U.S.). Surveyed in 1921 and 1922.;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.).