|
USA | |
| Ransome, Frederick Leslie (1901) A report on the economic geology of the Silverton quadrangle, Colorado. USGS Bull 182 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Rob Lavinsky |
| U.S. Geological Survey Professional Paper 1753 |
| U.S. Geological Survey Professional Paper 1753 |
| U.S. Geological Survey Professional Paper 1753 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |