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| Rocks & Min. 80:251 |
| Smith, Arthur E. (2005) New Hampshire mineral locality index. Rocks & Minerals, 80 (4) 242-261 doi:10.3200/rmin.80.4.242-261 |
| Moore, Paul B. (1973) Pegmatite Phosphates: Descriptive Mineralogy and Crystal Chemistry. The Mineralogical Record, 4 (3) 103-130 |
| Thompson, W. B., Falster, A. U., & Mortimer, T. J. (2022). The Keyes Mica Mines, Orange, Grafton County, New Hampshire. Rocks & Minerals, 97(4), 302-329. |
Fletcher Mine, Groton, Grafton County, New Hampshire, USA