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USA (FRL) | |
| Smith, Arthur E. Jr. (1997) Collecting Arkansas Minerals. L. R. Ream Publishing, Coeur d'Alene, ID. Rocks & Min. (1995): 70: 154-170. American Mineralogist, Volume 78, pages 437-440, 1993 |
| Owens, Don R. (1995) Minerals of the Wilson Springs Vanadium Mines, Potash Sulphur Springs, Arkansas. Rocks & Minerals: 70(3): 154-170. Howard, J. Michael |
North Wilson pit, Union Carbide Mine, Wilson Springs, Garland County, Arkansas, USA