1980. Struble, Richard A. Title assigned by cataloguer. prepared ... by Richard A. Struble and David A. Hodges. "Areal density of photo linears occurring within a 5000 meter... Ohio. Division of Geological Survey.
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1953. Calvert, Warren L. Scale 1:500 000. by Warren L. Calvert. Includes legend. Ohio. Division of Geological Survey.
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