Milling methods and costs at the Superior concentrator of the Engels Copper Mining Co., Plumas County, Calif. / by W.I. Nelson.
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of Commerce, Bureau of Mines,
1932.
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| Series: | Information circular (United States. Bureau of Mines) ;
6550. |
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