Calcite from selected localities.
USA | |
| Singewald, Quentin Dreyer; Butler, Bert Sylvenus (1941) Ore deposits in the vicinity of the London fault of Colorado. USGS Bulletin: 911 |
| Minerals of Colorado (1997) Eckel, E. B. |
USA | |
| Singewald, Quentin Dreyer; Butler, Bert Sylvenus (1941) Ore deposits in the vicinity of the London fault of Colorado. USGS Bulletin: 911 |
| Minerals of Colorado (1997) Eckel, E. B. |