11 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2007-08-30 08:44:52
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12 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2000-10-05 12:31:31
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13 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2013-07-01 14:27:55
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14 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2010-09-15 11:51:24
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15 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2012-07-16 08:45:02
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16 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2010-01-05 11:20:57
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17 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-07-16 08:47:45
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18 | Add to Reading ListSource URL: arkweb.er.usgs.govLanguage: English - Date: 2011-04-13 14:51:27
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19 | Add to Reading ListSource URL: www.ogs.ou.eduLanguage: English - Date: 2011-10-10 17:32:27
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20 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-10-17 13:19:36
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