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Drainage of methane from the overlying Pocahontas no. 4 coalbed from workings in the Pocahontas no. 3 coalbed

Gerald L. FinfingerJoseph Cervik

出版	na, 1979
URL	http://books.google.com.hk/books?id=tYyaMQEACAAJ&hl=&source=gbs_api