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Report on the Coal Mines of the Monongahela River Region
其他書名
From the West-Virginia State Line to Pittsburgh, Including the Mines on the Lower Yougghiogheny River
出版Board of Commissioners for the Second Geological Survey of Pennsylvania, 1884
URLhttp://books.google.com.hk/books?id=qBQgRge4JF0C&hl=&source=gbs_api
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