- Tombstone Mining District
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 219, 392 Romslo, T.M. & S.F. Ravitz (1947), Arizona manganese-silver ores, US Bur. Mines Rept. Inv. 4097. Rasor, C.A. (1939), Manganese mineralization at Tombstone, AZ, Econ.Geol.: 34: 790-803 Butler, B.S., et al (1938b), Geology and ore deposits of the Tombstone district, AZ, AZ Bur. Mines Bull. 143 |