Milling method and cost at the conglomerate mill of the Calumet & Hecla Consolidated Copper Co.
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| Format: | Government Document Book |
| Language: | English |
| Published: |
[Washington] :
Dept. of Commerce, U.S. Bureau of Mines,
1930.
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| Series: | Information circular (United States. Bureau of Mines) ;
6364. |
| Subjects: |