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Carboniferous - Greene formation; Washington formation; Monongahela formation (3) |
Geology -- United States --Maps (3) |
Neogene - Carmichaels formation (3) |
Geology -- Pennsylvania -- Greene County -- Maps (1) |
Geology -- Pennsylvania -- Washington County -- Maps (1) |
Geology--Pennsylvania--Greene County--Maps (1) |
Geology--Pennsylvania--Maps (1) |
Natural gas -- Pennsylvania -- Greene County -- Maps (1) |
Natural gas -- Pennsylvania -- Washington County -- Maps (1) |
Petroleum -- Pennsylvania -- Greene County -- Maps (1) |