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Showing The geology of Pittsburgh and its environs: a popular account of the general geological features of the region by Henry Leighton

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Important places

Pittsburgh (1,170)

Counties

Allegheny (1,224)

Regions

Pennsylvania (4,458)

Countries

United States (64,950)

Other geographical areas

Allegheny Plateau (173)
Appalachian Mountains (1,111)

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