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2. Base map of Illinois

Yale Public content
1924. 2011-03-01T17:06:50Z. 2011-03-01T17:06:50Z. Illinois State Geological Survey. The Survey. English. Public. Illinois.

6. Geologic map index of Illinois

Yale Public content
1987. 2002-06-01T04:00:00Z. 2018-05-11T18:34:02Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Illinois and Illinois.

10. State of Illinois

Yale Public content
1974. 2012-02-28T19:27:07Z. 2015-10-21T15:30:45Z. Geological Survey (U.S.). The Survey. English. Public. Illinois.