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USA | |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 343, 425 Butler, B.S., et al (1938b), Geology and ore deposits of the Tombstone district, AZ, AZ Bur. Mines Bull. 143.. |
| Luetcke, Rolf (n.d.) Personal communication. |
- Contention-Grand Central Mine group
| Dana 6:1093. |
| Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187, Index of Mining Properties in Cochise County, AZ: 75 Dana 6:1093. |
| Rob Bowell, lab tested |
| Rob Bowell |
| Luetcke, Rolf (n.d.) Personal communication. |
| Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187, Index of Mining Properties in Cochise County, AZ: 75. |
| MRDS database Dep. ID file #10039571, MRDS ID #M050352. |
| Bob Griffis |
| Luetcke, Rolf (n.d.) Personal communication. |
| Luetcke, Rolf (n.d.) Personal communication. |
| Luetcke, Rolf (n.d.) Personal communication. |
| Luetcke, Rolf (n.d.) Personal communication. |
| Mineralogical Record 21:481-492, 501 |
| Dana 6: 1093. |
Toughnut Mine, Tombstone, Tombstone Mining District, Cochise County, Arizona, USA