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Start Over Year 1926 Subject Railroads

1. Illinois-Wisconsin, McHenry quadrangle

Maps University Of Illinois Urbana Champaign Public content
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.).