Kidwellite from
USA | |
| 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, T.J., Roberts, W.L. (1985) Mineral Localities in the Black Hills of South Dakota. Rocks & Minerals: 60(3): 109-118 (116). |
Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA