Coal resources of Allegheny County, Pennsylvania / compiled by Clifford H. Dodge.Clifford H. Dodge · First published 1985Open the Tome
Coal resources of Greene County, Pennsylvania / compiled by Clifford H. Dodge and Albert D. Glover.Clifford H. Dodge · First published 1984Open the Tome
Bedrock geologic map, coal-resource maps, and digital datasets of the Kersey quadrangle, Elk and Clearfield counties, PennsylvaniaClifford H. Dodge, Geological Survey of Pennsylvania, Pennsylvania. Department of Conservation and Natural Resources · First published 2005Open the Tome
Bedrock geologic map, coal-resource maps, and digital datasets of the Brandy Camp quadrangle, Elk, Jefferson, and Clearfield counties, PennsylvaniaClifford H. Dodge, Geological Survey of Pennsylvania, Pennsylvania. Department of Conservation and Natural Resources · First published 2004Open the Tome
