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| Swanson, S. E., Veal, W. B. (2010) Mineralogy and petrogenesis of pegmatites in the Spruce Pine District, North Carolina, USA. Journal of GEOsciences, 55 (1) 27-42 |
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| Erd,Richard C.,(1996) U.S Geological Survey unpublished data |
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Hawk Mine, Hawk-Bakersville, Mitchell County, North Carolina, USA