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Open-pit Copper Mining and Concentrating Methods and Costs, Silver Bell Unit, American Smelting and Refining Co., Pima County, Ariz
William R. Hardwick
出版U.S. Bureau of Mines, 1963
URLhttp://books.google.com.hk/books?id=AnutYl7oE9QC&hl=&source=gbs_api
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