1977. White, George W. 1903-1985. by George W. White. Includes bibliography. Ohio Docs no.: ONR 84.19:101. Ohio. Division of Geological Survey.
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1977. Duffield, Susan L. Base map by U.S. Geological Survey. Scale approximately 1:500,000 compiled by Susan L. Duffield ; cartographer, R. Anne Berry. Ohio. Division of Geological Survey.