61 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-02-19 15:08:17
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62 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-03-10 08:48:37
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63 | Add to Reading ListSource URL: sites.nationalacademies.orgLanguage: English - Date: 2014-08-13 23:06:43
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64 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-03-24 10:39:32
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65 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-01-29 11:07:33
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66 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 15:11:08
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67 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 14:51:07
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68 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-01-27 08:40:32
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69 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 09:00:13
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70 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 10:20:49
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