Covellite from Madison County, Montana, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Mineralogical Magazine 1996 60 : 871-876 |
Koschmann, Albert Herbert, Bergendahl, M.H. (1968) Principal gold-producing districts of the United States. Professional Paper 610. US Geological Survey doi:10.3133/pp610 | |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. |