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Geology of Pennsylvania / Geology of West Virginia / Economic geology / Coal mining / Coal / Fuels / Pittsburgh coal seam / Pittsburgh / Monongahela River / Geography of Pennsylvania / Geography of the United States / Pennsylvania
Date: 2002-02-13 05:29:20
Geology of Pennsylvania
Geology of West Virginia
Economic geology
Coal mining
Coal
Fuels
Pittsburgh coal seam
Pittsburgh
Monongahela River
Geography of Pennsylvania
Geography of the United States
Pennsylvania

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