Guidebook - State of Ohio, Division of Geological Survey.

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Item Link Original Source
Limited (search only)   no.1-4 University of Michigan
Limited (search only)   no.1-4 University of California
Limited (search only)   no.4 1975 The Ohio State University
Limited (search only)   no.5-8 University of California
Limited (search only)   no.6 1992 The Ohio State University
Limited (search only)   no.6 1992 The Ohio State University
Limited (search only)   no.10 University of California
Limited (search only)   no.13-14 1998 University of Michigan