1986. Schmidt, James J. Relief shown by contours and spot heights. by James J. Schmidt ; cartography, David S. Orr. Scale 1:62,500 "Total copies printed: 500." Includes lo... Ohio. Department of Natural Resources.
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1986. Struble, Richard A. Includes references. Relief shown by contour lines and spot heights. Includes text, 3 tables, location map, and water-well logs. by Richard A. Stru... Ohio. Division of Geological Survey.
1953. Calvert, Warren L. Scale 1:500 000. by Warren L. Calvert. Includes legend. Ohio. Division of Geological Survey.