- Tombstone Mining District
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 219, 392 Galbraith, F.W. (1947), Minerals of AZ, AZ Bur. Mines Bull. 153: 28. Butler, B.S., et al (1938b), Geology and ore deposits of the Tombstone district, AZ, AZ Bur. Mines Bull. 143 |