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USA | |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Weber, F. Harold Jr. (1963) Geology and mineral resources of San Diego County, California. County Report 3. California Division of Mines and Geology Hudson, Frank Samuel (1922), Geology of the Cuyamaca region of California with special reference to the origin of the Nickeliferous pyrrhotite: University of California, Department of Geological Sciences Bulletin: 13: 217 Calkins, F.C. (1916), An occurrence of nickel ore in San Diego County, California: USGS Bulletin 640: 78, 79 Van Nostrand Reinholt Press: 66, 70. |
- Callahan Mining District (Scott River Mining District)
| Murdoch, Joseph, Webb, Robert W. (1966) Minerals of California, Centennial Volume (1866-1966) - California Division Mines and Geology, Bulletin 189. p.1-559. Aubury, Lewis E. (1905) The Copper Resources of California. Bulletin 23. California State Mining Bureau |
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| Sears, John H. (1893). On the Occurrence of Augite and Nepheline Syenites in Essex County, Mass. (Bulletin of the Essex Institute, Vol. 25, pp. 11-125.) |
| Sharygin, V.V., et al. (1992) Scientific Journal Russian Geology and Geophysics: 44(9). |
| Min.Rec.:21:103 Dana 6:1069 Dana 7:I:235,241 & II:490. (Ref 2) Second Geological Survey of Pennsylvania: 1874. Preliminary Report on the Mineralogy of Pennsylvania, F. A. Genth Pgs. 13, 14 |
| Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey. Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey. |
| V.V. Sharygin et al. , Scientific Journal Russian Geology and Geophysics, Sept. 2003, Vol. 44, N°9. |
Gap Mine, Bart Township, Lancaster County, Pennsylvania, USA