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USA | |
| 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 |
| Rocks & Min.: 14: 4-9. |
| 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 |
| Beck, Lewis (1842) Mineralogy of New York |
| (Mid-Hudson Valley Gem & Mineral Society field trips, March 2006) |
| Betts, John (n.d.) John Betts website listing. Rocks & Min.:8:61-65. |
| 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 |
| (Bridenbaugh, 1873) (Januzzi, 1966, 1989) (Manchester, 1931) (Trainer, 1938, 1941, 1942) (Whitlock, 1903). |
Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA