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Geological Survey of Ohio; Geology, Vol. VII, by Professor Edward Orton, State Geologist — latest news, discussion & facts — IJR
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Geological Survey of Ohio; Geology, Vol. VII, by Professor Edward Orton, State Geologist
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scholarly article
Geological Survey of Ohio; Geology, Vol. VII, by Professor Edward Orton, State Geologist
scholarly article published in April 1895
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