11 | Add to Reading ListSource URL: www.earth.utah.eduLanguage: English - Date: 2014-09-09 12:22:52
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12 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-10-26 17:37:54
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13 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2014-10-23 18:15:00
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14 | Add to Reading ListSource URL: www.blm.govLanguage: English - Date: 2014-12-10 13:46:20
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15 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2011-06-10 17:21:09
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16 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2013-06-20 15:11:49
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17 | Add to Reading ListSource URL: www.iodp.orgLanguage: English - Date: 2012-05-16 22:40:51
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18 | Add to Reading ListSource URL: gjem.energy.govLanguage: English - Date: 2010-06-01 15:51:05
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19 | Add to Reading ListSource URL: azgs.az.govLanguage: English - Date: 2011-10-05 02:04:30
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20 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2006-06-08 12:54:01
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