| U.S. Bureau of Mines Publications, Alaska | |
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U.S. Bureau of Mines Report of Investigations 2160 |
| Title: | Recovery of Gold from Black Sand by Classified Concentration | |
| Author: | John A. Davis and J. Gross | |
| Year: | 1920 | |
| Pages: | 3 pp. | |
| Availability: | Contact librarian for availability |
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