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USA | |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Van Nostrand Reinholt Press: 76 |
- Knoxville Mining District
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| Emmons, S. F., Becker, G. F. (1885) Statistics and Technology of the Precious Metals. Bureau of the Census. |
| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 87. Lindgren, Waldemar (1894a), The gold-silver veins of Ophir, California: USGS 14th. Annual Report, part 2: 273 |