1982. Hartzell, Glenn W. by Glenn W. Hartzell ; cartography, Douglas E. Keen. Includes location map. Scale 1:62,500 Relief shown by contours and spot heights. Ohio. Division of Water.
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1986. Hartzell, Glenn W. Includes location map. Scale 1:62,500 Relief shown by contours and spot heights. by Glen W. Hartzell ; cartography, David S. Orr. Ohio. Department of Natural Resources.