Viktoras W. Skema / William E. Edmunds / Albert D. Glover / Jon D. Inners / Mark A. Sholes

UIUC:30112026920261

Bituminous coal

Viktoras W. Skema / Pennsylvania. Bureau of Topographic and Geologic Survey

UIUC:30112026920212

Bituminous coal

Pennsylvania. Department of Environmental Resources. (Bureau of) Topographic and Geologic (Geological Survey)

OCLC:150490238

Pennsylvania. Bureau of Topographic and Geologic Survey / Pennsylvania. Topographic and Geological Survey Commission / Robert D. Sponseller

LCCN:74622027

Bituminous coal

Viktoras W. Skema

OCLC:1139511685

Bituminous coal