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Report of Progress in the Cambria and Somerset District of the Bituminous Coal-fields of Western Pennsylvania
Franklin PlattPennsylvania. Board of Commissioners for the Second Geological SurveyWilliam Greenough Platt
其他書名
Part II. Somerset
出版Board of Commissioners, 1877
URLhttp://books.google.com.hk/books?id=oMjSQwAACAAJ&hl=&source=gbs_api