Soapstone from
USA | |
| Hitchcock, Edward (1841): Final Report on the Geology of Massachusetts, Vol. 1., p. 157. Wall, Eby, and Winter, 2004. |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
| Hitchcock, Edward (1841): Final Report on the Geology of Massachusetts, Vol. 1., p. 157. |
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Jackson, 1844. Final Report on The Geology and Mineralogy of NH, p. 169 | |
Meyers, T.R., Stewart, G.W. (1956) The Geology of New Hampshire - Part III: Minerals and Mines. New Hampshire Department of Resources and Economic Development. | |
Hitchcock, Charles (1869). First Annual Report upon the Geology and Mineralogy of the State of New Hampshire. | |
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| Jackson, 1844. Final Report on The Geology and Mineralogy of NH |