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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
Franklin Platt
William Greenough Platt
出版
Board of Commissions
, 1877
URL
http://books.google.com.hk/books?id=JJd1AQAACAAJ&hl=&source=gbs_api
