Undercut block-caving method of mining in western copper mines / by E.D. Gardner.
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| Online Access: |
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of Commerce, Bureau of Mines,
1930.
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| Series: | Information circular (United States. Bureau of Mines) ;
6350. |
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| Item Description: | At head of title: Department of Commerce--Bureau of Mines. No.6326-6350 issued bound together. |
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| Physical Description: | 44 pages : illustrations ; 28 cm. |
| Action Note: | committed to retain 20170101 20420101 Alliance Shared Trust https://www.coalliance.org/shared-print-archiving-policies) |