2001. Eastern Energy Resource Surveys Team (Geological Survey). This polygon shapefile shows the coal fields of Alaska and the conterminous United States. Most of the material for the conterminous United States ... National Atlas of the United States.
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1947. White, George W. (George Willard), 1903-1985. compiled by Geo. W. White. Scale approximately 1:56,000. Ohio. Division of Geological Survey.
1947. White, George W. (George Willard), 1903-1985. Scale approximately 1:56,000. compiled by Geo. W. White. Ohio. Division of Geological Survey.
1947. White, George W. (George Willard), 1903-1985. compiled by Geo. W. White. Scale approximately 1:56,000. Ohio. Division of Geological Survey.