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USA | |
| Thompson, Woodrow B., Bearss, Gene T., Falster, Alexander U., Simmons, William B., Nizamoff, Jams W. (2000) The Estes Quarry, Cumberland County, Maine: A New Pegmatite Mineral Locality. Rocks & Minerals, 75 (6) 408-418 doi:10.1080/00357520009605667 Rocks and Minerals (1999) 74:188,189 |
| Betts, John (n.d.) John Betts website listing. |
| Morrill, P. et al. (1958) |
| Thompson, Woodrow B., Joyner, Ronald L., Woodman, Raymond G., King, Vandall T. (1998) Bulletin (41), A Collector's Guide to Maine Mineral Localities (3rd ed.) Maine Geological Survey |
| S Segedy collection, 2008 |
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| Thompson, W.B., et.al., 1991, Maine Mineral Localities, 2nd edition, Maine Geological Survey, Augusta. |
| P. Cristofono collection |
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Brunswick, Cumberland County, Maine, USA