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USA | |
| Cook, L.P. (1974) Metamorphosed Carbonate Rocks of the Nashoba Formation, Eastern Massachusetts. Cambridge, Massachusetts: Harvard University PhD Dissertation, 454 pages. |
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| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. Barton, W.R., Goldsmith, C.E. (1968) New England Beryllium Investigations. U.S. Depaartment of the Interior, Bureau of Mines Report of investigations 7070. 177 pages and maps. |
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| P. Cristofono collection, 2013 |
| Jackson, Charles T., personal correspondence quoted in: Hitchcock, Edward (1835). Report on the Geology, Mineralogy, Botany, and Zoology of Massachusetts, pp. 310-311. |
| Cook, 1974 |
| P Cristofono collection, 2006 |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
Chelmsford, Middlesex County, Massachusetts, USA