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Analysis of 494 Accidents, Open-pit Iron-ore Mines, Beneficiation Plants, and Shops Lake Superior District
Reino O. PynnonenL. J. ZaverlAllen D. Look
出版U.S. Department of the Interior, Bureau of Mines, 1959
URLhttp://books.google.com.hk/books?id=3_eB1Pjsy-oC&hl=&source=gbs_api
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