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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 |
| NY State Museum Bull. Nos. 249-250, Magnetic Iron Deposits of SE NY, Clarke, John M. (Sep-Oct 1921): 118. |
| NY State Museum Bull. Nos. 249-250, Magnetic Iron Deposits of SE NY, Clarke, John M. (Sep-Oct 1921): 116. |
| NY State Museum Bull. Nos. 249-250, Magnetic Iron Deposits of SE NY, Clarke, John M. (Sep-Oct 1921): 120. |