Illinois State Geological Survey guidebook.

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Item Link Original Source
Limited (search only)   no.13 1979 The Ohio State University
Limited (search only)   no.14 The Ohio State University
Limited (search only)   no.15 The Ohio State University
Limited (search only)   no.15A The Ohio State University
Limited (search only)   no.16 The Ohio State University
Limited (search only)   no.16-17 University of Michigan
Limited (search only)   no.17 1985 The Ohio State University
Limited (search only)   18 (1985) University of Minnesota