... Final Report Ordered by Legislature, 1891: A Summary Description of the Geology of Pennsylvania, in Three Volumes, With a New Geological Map of the State, a Map and List of Bituminous Mines ..., Part 2
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... Final Report Ordered by Legislature, 1891: A Summary Description of the Geology of Pennsylvania, in Three Volumes, With a New Geological Map of the State, a Map and List of Bituminous Mines ..., Part 2
