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Sideboard Device for Improved Face Ventilation in Coal Mines

Edward F. DiversJohn C. LaScolaFred N. Kissell

出版	Department of the Interior, Bureau of Mines, 1979
URL	http://books.google.com.hk/books?id=olbE1JOTpBwC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN