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by Drost, J. J.
Published: U.S. Bureau of Mines, 1974
Description: 8 pages : illustrations, tables. ; 26 cm.
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by Drost, J. J.
Published: U.S. Dept. of Interior, Bureau of Mines, 1973
Description: 15 pages : illustrations ; 26 cm.
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Iron ores Magnetic separation of ores Ore-dressing Scrap metals Steel Taconite