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USA | |
| King, V. (ed), 2009, Maine Feldspar, Families, and Feuds. |
| King, Van (n.d.) Personal communcation. |
| Mineral News (1993) 9:2 p. 8 |
| Morrill, Phillip and a Lot of Other People, 1959, Maine Mines and Minerals, v. 1. |
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| 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, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
| Arthur Smith (2003) "Is there any lead at the Porter Lead Mine?", Mineral News, 19, #3, 1-2. |
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| Bastin, Edson Sunderland (1911) Geology of the pegmatites and associated rocks of Maine, including feldspar, quartz, mica, and gem deposits. USGS Bulletin 445. |
Lord Hill Quarry, Stoneham, Oxford County, Maine, USA