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USA | |
| Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. Johnson, Maureen G. (1977) Geology and Mineral Resources of Pershing County, Nevada. Bulletin 89. Nevada Bureau of Mines |
- Mount Tobin Mining District
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Harpel, G. (1980). Geology and tungsten mineralization of a portion of the Ragged Top mining district, Pershing County, Nevada (Masters thesis, University of Nevada, Reno). |
| [var. Agate] Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology |
- Tobin and Sonoma Range Mining District
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Christopher Wentzell collection, dug 2016-2017 |
| [var. Agate] Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology |
Tunnel Hill Mine, Velvet Mining District, Pershing County, Nevada, USA