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USA | |
| Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ. Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 97. |
| Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 97. |
- Middle Pass Mining District
| Gilluly, J. (1937), AZ Bur. of Mines Bull. 141: 106-107. |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 431. Silver, L.T. & S. Deutsch (1963), Uranium-lead isotope variations in zircons: A case study, Jour. Geol.: 71: 721-758. |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 431. |