31 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2004-04-28 10:42:05
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32 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2004-04-28 10:42:55
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33 | Add to Reading ListSource URL: www.blm.govLanguage: English - Date: 2014-08-02 16:32:20
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34 | Add to Reading ListSource URL: geology.utah.govLanguage: English - Date: 2003-06-04 11:47:01
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35 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2007-01-18 17:22:58
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36 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-11-02 16:22:48
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37 | Add to Reading ListSource URL: nmgs.nmt.eduLanguage: English - Date: 2008-08-14 12:44:58
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38 | Add to Reading ListSource URL: paleo.cortland.eduLanguage: English - Date: 2007-11-19 15:35:38
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39 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-12-11 14:43:58
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40 | Add to Reading ListSource URL: eprints.gla.ac.ukLanguage: English - Date: 2011-08-15 10:07:06
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