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USA | |
| Williams (circa 1945) |
| Williams, Horace S. (circa 1945): Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut. |
| Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp. |
| Schooner, Richard. (circa 1990), Untitled manuscript on central Connecticut mineralogy. Moritz, Harold (n.d.) Personal Communication. |
| Williams, Horace S. (circa 1945): Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut. |
| Williams, Horace S. (circa 1945): Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut. |
State Route 9 and State Route 81 Interchange, Higganum, Haddam, Middlesex County, Connecticut, USA