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USA | |
| Kink, V. and Foord, E.E., 1992 Maine Mineralogy, Vol. 1, Maine Geologic Surevey, Augusta. |
| King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
| King, Van (n.d.) Personal communcation. |
| King, Vandall T. (2000) Mineralogy of Maine Vol. 2 - Mining History, Gems, and Geology. Maine Geological Survey. King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
| King, V. T., 2006, Minerals of Halls Ridge and Plumbago-Puzzle Mountain, Newry, ... Maine, Mineral News, v. 22(6): p. 1-3. |
| King, Van (n.d.) Personal communcation. |
| Tim Blake, Lookout Mine Owner |
| King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
Mount Rubellite Quarries, Mount Rubellite, Hebron, Oxford County, Maine, USA