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Start Over Author Illinois State Geological Survey Publisher State of Illinois, Dept. of Registration and Education, State Geological Survey Division

1. Geologic map of Illinois

Yale Public content
1917. 2018-05-15T17:54:45Z. 2018-05-15T17:54:45Z. Illinois State Geological Survey. State of Illinois, Dept. of Registration and Education, State Geological Survey Division. English. cartographic image. Public. Illinois and Illinois.

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