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Start Over Year 1923 Publisher Geological and Natural History Survey (Madison, Wis.) Bounding Box -180 -89.81531 180 89.456192

1. Illinois-Wisconsin, Grays Lake quadrangle : topography

Maps University Of Illinois Urbana Champaign Public content
1923. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1919-1920.";"Surveyed in cooperation with the States of Illinois and Wisconsin.";Relief shown by contours an... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Geological and Natural History Survey (Madison, Wis.).

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