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Proceedings of the International Workshop on Rock Mass Classification in Underground Mining

出版	Deptartment of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, 2007
URL	http://books.google.com.hk/books?id=y6ngAAAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN