11 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-11-30 09:23:57
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12 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2010-01-05 11:22:00
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13 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2001-01-16 08:38:25
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14 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-07-08 08:43:27
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15 | Add to Reading ListSource URL: nadp.sws.uiuc.eduLanguage: English - Date: 2008-11-10 13:06:54
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16 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-12-09 07:26:32
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17 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-01-28 10:44:36
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18 | Add to Reading ListSource URL: www.purdue.eduLanguage: English |
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19 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2013-02-06 18:31:00
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20 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2014-11-18 10:43:41
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