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Barrier Pillars in the Western Middle Field, Anthracite Region of Pennsylvania, by S.H. Ash, D.O. Kennedy, H.B. Link and W.M. Romischer

S. H. AshD. O. KennedyH. B. LinkW. M. RomischerEtats-Unis. Mines (Bureau)

出版	U.S. Government Printing Office, 1953
URL	http://books.google.com.hk/books?id=p8UftwAACAAJ&hl=&source=gbs_api