|
USA | |
| Matthew Lambert |
| Nicolay, H.H., Stone, A.V. (1967) Rocks & Minerals: A Guide For Collectors of the Eastern United States. A.S. Barnes & Co. New York, 255 pages. |
| Hitchcock, Edward, Hager, Albert D., Hitchcock, Edward Jr., Hitchcock, Charles H. (1861) Report on the Geology of Vermont - Descriptive, Theoretical, Economical, and Scenographical Vol. 2. The State Geologist, Proctorsville, VT. |
| Nicolay & Stone (1967), Rocks & Minerals: A Guide For Collectors of the Eastern US, p.179 |
| Morrill & Chaffee, 1957. VT Mines & Mineral Localities |
| Nicolay & Stone (1967), Rocks & Minerals: A Guide For Collectors of the Eastern US |