11 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-09-18 06:56:41
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12 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2008-06-18 12:09:14
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13 | Add to Reading ListSource URL: www.idahogeology.orgLanguage: English - Date: 2008-08-15 18:05:31
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14 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-12-02 12:09:26
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15 | Add to Reading ListSource URL: www.americangeosciences.orgLanguage: English - Date: 2013-12-12 14:22:48
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16 | Add to Reading ListSource URL: www.geoconvention.comLanguage: English - Date: 2014-04-20 15:59:48
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17 | Add to Reading ListSource URL: www.usinfo.plLanguage: English - Date: 2014-03-25 11:26:24
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18 | Add to Reading ListSource URL: nature.nps.govLanguage: English - Date: 1999-10-06 12:00:07
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19 | Add to Reading ListSource URL: www.jameskay.comLanguage: English - Date: 2012-06-30 15:58:24
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20 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2009-05-05 16:16:43
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