1927. United States. Bureau of Public Roads. Eastern sheet Includes inset continuation of northern Kentucky counties: Boone, Kenton and Campbell.; "Data corrected to Jan. 31, 1927."; "Approved... Bureau of Public Roads (Washington, D.C).
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1912. Geological Survey (U.S.). Relief shown by contours and spot heights. 69 x 78 centimeters Scale 1:62,500 General Map Collection. U.S. Geological Survey (Washington, D.C).