Author: Illinois State Geological Survey / Publisher: The Survey - Yale University Library GeoBlacklight Search Results

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

1911. 2011-01-28T14:44:18Z. 2016-11-22T22:17:32Z. Illinois State Geological Survey. The Survey. English. Public. Illinois.

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