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USA | |
| King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
| Boucot, Arthur J., Harper, Charles, and Rhea, Keith, 1959, Geology of the Beck Pond Area, Township 3 - Range 5, Somerset County, Maine, Special Geologic Studies Series 1, Department of Economic Development, Augusta, Maine, pp 33, + map. |