61 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-02-05 09:33:03
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62 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-02-04 07:26:05
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63 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-01-19 09:19:24
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64 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-11-27 14:48:33
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65 | Add to Reading ListSource URL: www.intlmag.orgLanguage: English - Date: 2014-04-14 17:39:28
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66 | Add to Reading ListSource URL: www.uwgb.eduLanguage: English - Date: 2014-04-05 16:58:44
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67 | Add to Reading ListSource URL: www.semanticdesigns.comLanguage: English - Date: 2004-06-02 15:07:27
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68 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 18:45:29
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69 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 11:03:15
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70 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-09-05 11:48:28
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