Recent progress in the thawing of frozen gravel in placer mining.
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Main Author: | |
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Corporate Authors: | , |
Other title: | Thawing frozen gravel. |
Format: | Government Document Book |
Language: | English |
Published: |
Washington :
Govt. Print. Off,
1922.
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Series: | Technical paper (United States. Bureau of Mines) ;
309. |
Subjects: |