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Analyses of Ash from United States Coals, by W.A. Selvig and F.H. Gibson

W. A. SelvigF. H. GibsonEtats-Unis. Mines (Bureau)

出版	U.S. Government Printing Office, 1956
URL	http://books.google.com.hk/books?id=XqwItwAACAAJ&hl=&source=gbs_api