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Coal and Metal/nonmetal Entry Level Training Student Text Material
United States. Mine Safety and Health Administration
出版
U.S. Department of Labor, Mine Safety and Health Administration, National Mine Health and Safety Academy
, 1994
URL
http://books.google.com.hk/books?id=8kIVjScSLnUC&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN