|
USA | |
| [var. Pitchblende] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| [var. Pitchblende] (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| [var. Pitchblende] USGS: Geological Survey Circular 294 |
| [var. Pitchblende] USGS: Geological Survey Circular 294 |
| [var. Pitchblende] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| [var. Pitchblende] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |