1982. Schmidt, James J. Includes location map. by James J. Schmidt (after Norris, S.E. 1952) ; cartography, Douglas E. Keen. Scale 1:62,500 Relief shown by contours and sp... Ohio. Division of Water.
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1987. Risser, Michele. Includes references. Scale 1:63,360 by Michele L. Risser ; cartographic drafting by Robert L. Stewart. Includes text, 2 tables, and location map. R... Ohio. Division of Geological Survey.