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Pennsylvania Geological Survey of the Pennsylvania Department of Conservation & Natural Resources




Sevon, W.D., comiler, 2000, "Physiographic provinces of Pennsylvania", Pennsylvania Geological Survey of the Pennsylvania Department of Conservation and Natural Resources, Pennsylvania Geological Survey, 4th ser., Map 13, scale 1:2,000,000. Source obtained by wikimedia.

Geology of Pa.




Maybe our future doesn't have to be based upon the past.

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