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USA | |
| Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635 |
| Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635 |
| Roberts, Willard Lincoln, Rapp, George Jr. (1965) Mineralogy of the Black Hills. Bulletin 18. South Dakota School of Mines and Technology Redden, Jack Allison (1959) Beryl deposits of the Beecher No.3 Black Diamond pegmatite, Custer County, South Dakota. USGS Bulletin: 1072- |
| U.S. Geological Survey Professional Paper 297 |
| Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E. |
| Roberts, Willard Lincoln, Rapp, George Jr. (1965) Mineralogy of the Black Hills. Bulletin 18. South Dakota School of Mines and Technology |
| Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635 |
- Unorganized mining district [1]
| USGS Prof Paper 297D |
| E.L. Clopton collection |
- Keystone Gold Mining District
| Rocks & Min.:10:145-146. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| USGS Prof Paper 297B |
| Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635 USGS Prof Paper 297A |
| Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E. |
| Roberts, Willard Lincoln, Rapp, George Jr. (1965) Mineralogy of the Black Hills. Bulletin 18. South Dakota School of Mines and Technology |
| Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635 |
US highway 16 roadside occurrence, Custer County, South Dakota, USA