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1
Stratigraphy of the Cambrian and Lower Ordovician rocks in Ohio,
by Janssens, Adriaan
Columbus, State of Ohio, Division of Geological Survey, 1973

Book
2
Sub-Trenton rocks from Lee County, Virginia, to Fayette County, Ohio /
by Calvert, Warren L. (Warren Lytle)
Columbus : State of Ohio, Dept. of Natural Resources, Division of Geological Survey, 1962

Government Document Book
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