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Procedure in Sealing and Unsealing Mine Fires and in Recovery Operations Following Mine Explosions, Revised March 1938, by J.J. Forbes and G.W. Grove

J. J. ForbesG. W. GroveEtats-Unis. Mines (Bureau)

出版	U.S. Government Printing Office, 1938
URL	http://books.google.com.hk/books?id=jeqcXwAACAAJ&hl=&source=gbs_api