11 | Add to Reading ListSource URL: www.geology.ohio-state.eduLanguage: English - Date: 2013-08-21 12:04:44
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12 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2010-04-05 09:38:50
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13 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2013-05-06 11:37:26
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14 | Add to Reading ListSource URL: www.gpo.govLanguage: English - Date: 2013-08-22 14:58:37
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15 | Add to Reading ListSource URL: www.gpo.govLanguage: English - Date: 2013-01-16 13:35:54
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16 | Add to Reading ListSource URL: www.americangeosciences.orgLanguage: English - Date: 2013-12-12 14:22:48
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17 | Add to Reading ListSource URL: www2.nature.nps.govLanguage: English - Date: 2013-07-31 16:33:56
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18 | Add to Reading ListSource URL: www.moabutah.infoLanguage: English - Date: 2009-01-23 12:29:36
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19 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2012-10-02 17:26:42
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20 | Add to Reading ListSource URL: www.nps.govLanguage: Spanish - Date: 2012-02-09 11:31:22
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