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Variation in Degree of Coalification and Petrografic Composition of Coals from the Western Sector of the Mikołow Deposit

Ewa Skowronek

出版	Główny Inst. Górnictwa, 1993
URL	http://books.google.com.hk/books?id=jU7GtgAACAAJ&hl=&source=gbs_api