1867. Blanchard, Rufus, 1821-1904. Includes 14 lines of "Explanations" on congressional townships.;1 map, colored;97 x 63 cm.;1:1,267,200 or 20 miles to 1 inch. Rufus Blanchard (Chicago, Ill.).
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1926. Geological Survey (U.S.). Relief shown by contours and spot heights.;"Control in part from railroad valuation surveys, Surveyed in 1924";Contour interval 10 feet.;1 map, col... Geological Survey Division (Urbana, Ill.) and Geological Survey (U.S.).