11 | Add to Reading ListSource URL: academics.concord.eduLanguage: English - Date: 2012-04-16 12:43:16
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12 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 15:33:27
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13 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 09:01:47
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14 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-01-30 09:59:45
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15 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-02-14 11:03:26
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16 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 10:08:54
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17 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-07-17 06:50:17
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18 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-10-31 06:59:17
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19 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-06-19 13:52:01
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20 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-11 10:56:20
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