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1. Illinois, Brighton quadrangle

Maps University Of Illinois Urbana Champaign Public content
1928. Geological Survey (U.S.). Surveyed in 1922 and 1924-1925.;Relief shown by contours and spot heights.;Road classification "July. 1927.";1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

2. Illinois, Gibson City quadrangle

Maps University Of Illinois Urbana Champaign Public content
1928. 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 1924-1925.";R... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).