Gypsum from Fall River County, South Dakota, USA
USA | |
| USGS Bull 1009 |
| USGS Bull 1009G |
Richardson G. B., (1903), The Upper Red Beds of the Black Hills, The Journal of Geology, Vol. 11, No. 4 (May – June). | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. |
Runge Mine, Edgemont Uranium Mining District, Fall River County, South Dakota, USA