The Dwight mineralogical zone of the Yorkville Till Member, northeastern Illinois /
Myrna M. Killey.

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Item Link Original Source
Limited (search only)   University of Illinois at Urbana-Champaign
Limited (search only)   University of Illinois at Urbana-Champaign
Limited (search only)   Information circular / Illinois State Geological Survey ; [no. 526] University of Illinois at Urbana-Champaign