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Canada | |
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Iran | http://iranian-agates.freeservers.com/ |
| http://iranian-agates.freeservers.com/ |
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Kazakhstan | |
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| Christian Bracke Collection |
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USA | |
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| Donald Volkman personally collected |
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| NBMG Spec Pub 31 Minerals of Nevada |
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| The Mineralogist, 21(12):462. |
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| Zeitner ,1968. Appalachian Mineral & Gem Trails |
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| Walker, D. and C. (1990) Cross country Mining: Lapidary Journal, v. 44, no. 1, p. 81-86. Trapper Creek Agate, Wyoming |
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