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Geology -- United States --Maps (4)
Neogene - Carmichaels formation (4)
Geology -- Pennsylvania -- Washington County -- Maps (2)
Natural gas -- Pennsylvania -- Washington County -- Maps (2)
Carboniferous - Conemaugh formation; Allegheny formation; Vanport limestone; Pottsville formation; Burgoon sandstone; Meadville shale; Cuyahoga formation (1)
Carboniferous - Greene formation; Washington formation; Monongahela formation (1)
Carboniferous - Greene formation; Washington formation; Monongahela formation; Conemaugh formation; Ames limestone (1)
Carboniferous - Monongahela formation; Conemaugh formation; Ames limestone; Allegheny formation (1)
Geology -- Pennsylvania -- Allegheny County -- Maps (1)
Geology -- Pennsylvania -- Armstrong County -- Maps (1)
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