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USA | |
| Cahoon, James C. (1985). Massachusetts: A Classic Swiss Alpine Cleft Mineral Region (Boston Mineralogical Symposium program book, May 1985) |
| Cook, 1974. |
| |
| 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. |
| P. Cristofono collection, 2013 |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
| P Cristofono collection 2010 |
| P Cristofono collection |
| 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 |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
| Garza, Steve (1980): Routes 495 and 290, Marlborough, Massachusetts (Boston Mineral Club Newsletter Dec., 1980). |
| P Cristofono collection, 2007 |
| P Cristofono collection, 2007 |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. Rocks & Min.: 22:11. |
| Januzzi, Ron E., Seaman, David M. (1976) Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut, USA. Rocks & Min.: 13:183 21:75. |
| P Cristofono collection, 2007 |
Aggregate Industries Quarry, Ashland, Middlesex County, Massachusetts, USA