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Silver Yield from Copper Ores and the Effects of 64.64-cent Silver on the Value of Copper Ores Produced in the United States
Elmer Walter Pehrson
出版U.S. Department of the Interior, Bureau of Mines, 1934
URLhttp://books.google.com.hk/books?id=xgKnqKGE-UUC&hl=&source=gbs_api
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