|
USA | |
- Altuda Mountain Mining District
| BEG Min Res Circ 73 |
| Morgan, L. A., & Shanks, W. C. (2008). Where magma meets limestone: Dagger Flats, an example of skarn deposits in Big Bend National Park. Geological, Geochemical and Geophysical Studies by the US Geological Survey in Big Bend National Park. US Geological Survey Circular, 1327, 43-55. |
| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |