Beraunite from Custer Mining District, Custer County, South Dakota, USA
USA | |
| Campbell, T.J., Roberts, W.L. (1986) Phosphate minerals from the Tip Top mine, Black Hills, South Dakota. The Mineralogical Record: 17: 237-254. Rocks & Minerals: 60: 117. |
| Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635 |