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MSHA Administrative Manual
United States. Mine Safety and Health Administration
其他書名
30 CFR Part 48-- Training and Retraining of Miners
出版
U.S. Department of Labor, Mine Safety and Health Administration
, 1985
URL
http://books.google.com.hk/books?id=eK-74ZEOvsMC&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN