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USA | |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
- Rico Mining District (Pioneer Mining District)
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Kucera, Ken (2021) The Bulldog Mountain Mine (aka Bulldog Mine), Blocks of Nearly Solid Silver, Creede Mining District, Mineral County, Colorado. CSM-Museum-Newsletter, 1-45 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Rocks & Min 70:5 pp 298-310 71:168-169 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Rosemeyer, Tom, Smith, Arthur E. (1986) Great Pockets: The National Belle Mine [Colorado]. The Mineralogical Record, 17 (4) 229-236 USGS Prof. Paper 750C |
- Lower San Miguel Mining District
| Econ Geol. (1995) 90:407-419 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |