Silver from Tyndall Mining District, Santa Cruz County, Arizona, USA
USA | |
| (1915) Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona. Bulletin Vol. 582. US Geological Survey doi:10.3133/b582 |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 333, 335, 385 Engineering & Mining Jour. (1912), The mining news: 97: 395. |