11 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2009-07-10 20:32:06
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12 | Add to Reading ListSource URL: geology.isu.eduLanguage: English - Date: 2010-05-03 15:05:31
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13 | Add to Reading ListSource URL: www.es.ucsc.eduLanguage: English - Date: 2008-04-25 18:57:44
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14 | Add to Reading ListSource URL: rri.wvu.eduLanguage: English - Date: 2011-08-30 17:08:50
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15 | Add to Reading ListSource URL: crustal.cr.usgs.govLanguage: English - Date: 2016-02-12 18:41:05
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16 | Add to Reading ListSource URL: cbth.uh.eduLanguage: English - Date: 2014-01-20 12:24:53
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17 | Add to Reading ListSource URL: www.gsnv.orgLanguage: English - Date: 2013-06-01 15:28:48
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18 | Add to Reading ListSource URL: tx.usgs.govLanguage: English - Date: 2015-11-30 07:58:08
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19 | Add to Reading ListSource URL: www.indiana.eduLanguage: English - Date: 2009-01-12 14:25:13
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20 | Add to Reading ListSource URL: www.ncgeolsoc.orgLanguage: English - Date: 2010-11-16 21:45:55
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