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PERMISSIBLE MINE EQUIPMENT APPROVED BY THE BUREAU OF MINES DURING 1965-66. SUPPLEMENT TO BULLETIN 543 AND INFORMATION CIRCULARS 8220 AND 8299
United States. Bureau of Mines
出版United States. Bureau of Mines.
URLhttp://books.google.com.hk/books?id=cx0yzwEACAAJ&hl=&source=gbs_api