Rock types of Pennsylvania [cartographic material] / compiled by Thomas M. Berg, W.D. Sevon, and Robin Abel ; James H. Dolimpio, cartographer.
- "Base map from Berg and others (1980) Geologic map of Pennsylvania, Pennsylvania Geological Survey, 4th ser., Map 1 scale 1:250,000, 3 sheets." Envelope title: Rock types of Pennsylvania : 1:500,000. On envelope: Commonwealth of Pennsylvania, Department of Environmental Resources, Office of Resources Management, Bureau of Topographic and Geologic Survey, Arthur A. Socolow, State Geologist, 1984. Includes notes.
- Commonwealth of Pennsylvania, Dept. of Environmental Resources, Topographic and Geologic Survey
- Held by
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