- La Plata Mining District (California Mining District)
| Cook, Robert B. (2010) Connoisseur's Choice: Calaverite, Cripple Creek, Colorado. Rocks & Minerals, 85 (5) 426-433 doi:10.1080/00357529.2010.494151 R & K Metals and Mining - Bob Ross - Part owner of the Bessie G |
Bessie G Mine, La Plata Mining District, La Plata County, Colorado, USA