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USA | |
| Seaman, David (1976) Pegmatite Minerals of the World. In Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Connecticut. |
| Roberts, Willard L., Campbell, Thomas J. (1986) Phosphate Minerals from the Tip Top Mine, Black Hills, South Dakota. The Mineralogical Record, 17 (4) 237-254 Campbell, Thomas J., Roberts, Willard L. (1985) Mineral Localities in the Black Hills of South Dakota. Rocks & Minerals, 60 (3) 109-118 doi:10.1080/00357529.1985.11764385 |
| 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 |
| Rocks & Minerals: 67(6): 380-388. |
White Elephant Mine, Cicero Peak, Pringle, Custer Mining District, Custer County, South Dakota, USA