Galena from Farncomb Hill, French Gulch, Breckenridge Mining District, Summit County, Colorado, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. Lovering, T.S., Goddard, E.N. (1950) Geology and ore deposits of the Front Range, Colorado. Professional Paper 223. US Geological Survey doi:10.3133/pp223 USGS Proffesional Paper 75 |
USGS Proffesional Paper 75 |