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USA | |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Emmons, S. F., Becker, G. F. (1885) Statistics and Technology of the Precious Metals. Bureau of the Census. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Emmons, S. F., Becker, G. F. (1885) Statistics and Technology of the Precious Metals. Bureau of the Census. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Ransome, Frederick Leslie (1901) A report on the economic geology of the Silverton quadrangle, Colorado. USGS Bull 182 |
| Rosemeyer, Tom, Smith, Arthur E. (1986) Great Pockets: The National Belle Mine [Colorado]. The Mineralogical Record, 17 (4) 229-236 USGS Prof. Paper 750C |
Pride of the West Mine, Cunningham Gulch, Animas Mining District, San Juan County, Colorado, USA