1909. Bownocker, J. A. 1865-1928. Scale [1:506,880]. Eight miles to one in. Geologic formations shown by colors and symbols. "Based on preceding maps by Newberry and Orton." "A. Hoe... Geological Survey of Ohio.
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1934. United States. Works Progress Administration of Pennsylvania. Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps shown by contours and spot heights. WPA Project N... Works Progress Administration of Pennsylvania.
1934. United States. Works Progress Administration of Pennsylvania. Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps shown by contours and spot heights. WPA Project N... Works Progress Administration of Pennsylvania.
1934. United States. Works Progress Administration of Pennsylvania. Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps shown by contours and spot heights. WPA Project N... Works Progress Administration of Pennsylvania.
1934. United States. Works Progress Administration of Pennsylvania. Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps shown by contours and spot heights. WPA Project N... Works Progress Administration of Pennsylvania.
1991. Hull, Dennis N. 1948-. Dennis N. Hull, chief compiler. Ohio. Division of Geological Survey.
2001. "Publication date: 11/2001." Cross section color-coded for geologic time period represented within the geologic layers. Includes notes, color cross... Ohio. Department of Natural Resources.
1958. Sturgeon, Myron Thomas, 1908-. geology by Myron T. Sturgeon and Associates ; geologic map compiled by Gilbert E. Smith and others ; drafting by Harold J. Flint. Scale 1:625,000. ... Ohio. Division of Geological Survey.
1948. Lamborn, Raymond E. 1890-. by Raymond E. Lamborn. "Base from topographic maps of U.S. Geological Survey." Relief shown by contours and spot heights. Scale 1:62,500. Ohio. Division of Geological Survey.
1947. White, George W. (George Willard), 1903-1985. "Base from topographic maps of U.S. Geological Survey." by George W. White. Relief shown by contours and spot heights. Scale 1:62,500.