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USA | |
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| King & Foord, 1994. Mineralogy of Maine, Vol. 1, p.304 |
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| King & Foord, 1994. Mineralogy of Maine, Vol. 1, p.304 |
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| Essex Institute (1885): Report of the Annual Meeting Held Monday, May 18, 1885. [Description of field trip of Oct 13, 1884] |
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| Ref.: Gordon, Samuel G. (1922), Mineralogy of Pennsylvania: 153. |
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| Gordon: Mineralogy of Pennsylvania, 1922 p. 159 |
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| Gordon: Mineralogy of Pennysylvania, 1922 p. 159 |
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| Gordon's Mineralogy of Pennsylvania (1922) p. 191 |