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Start Over Year 1936 Publisher Geological Survey Division (Urbana, Ill) Bounding Box -40.000931 39.999015 -39.999064 40.000987

1. Illinois, Potomac quadrangle.

Maps University Of Illinois Urbana Champaign Public content
1936. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1931-1932";(W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ);Relief shown by contours and spot heights.;Sho... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill).

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