Report of Progress in the Cambria and Somerset Districts of the Bituminous Coal-fields of Western Pennsylvania: Plate VIII. Copy of a map of the Bell's Gap Coal Field on the summit of the Allegheny Mountain in Cambria Co., Penna (Google eBook)
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Cited References - Pennsylvania Iron Furnace Sourcebook
1877 Report of Progress in the Cambria and Somerset District of the Bituminous Coal-Fields of Western Pennsylvania. Second Geological Survey of ...