1. Delineation of Rome Trough in eastern Kentucky by gravity and deep drilling data;Ammerman;Am. Assoc. Pet. Geol. Bull.,1979
2. Geologic map of the Willard quadrangle, eastern Kentucky;Brown;U.S. Geological Survey Map GQ-1387, 1:24,000,1977
3. Coal as a recorder of incipient rock metamorphism;Campbell;Econ. Geol.,1930
4. Geologic map of West Virginia;Cardwell;West Virginia Geological and Economic Survey, 1:250,000,1968
5. Regional coalification patterns for the coals of eastern Kentucky, Virginia, West Virginia, Ohio, Maryland, and southern Pennsylvania;Cole;West Virginia Geological and Economic Survey,1979