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USA | |
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| Januzzi, Ronald. E. (1994) Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut, USA. |
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| Schairer, John F. (1931): Minerals of Connecticut. State Geological and Natural History Survey of Connecticut Bulletin 51. |
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| Yale Peabody Museum collection |
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| King's Mark Environmental Review Team Report (1984) Old Quarry Nature Center Danbury, CT., King's Mark Resource Conservation & Development area, Warren, Connecticut. |
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| Shepard, Charles U. (1837), A Report on the Geological Survey of Connecticut. Hamlen, New Haven. |
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| Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1) New York Mineralogical Club |
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| 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. |
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| Moritz, Harold (n.d.) Personal Communication. |
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| Jeremy Zolan |
Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA