61 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-07-14 13:03:37
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62 | Add to Reading ListSource URL: www.geoconvention.comLanguage: English - Date: 2014-04-20 16:00:12
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63 | Add to Reading ListSource URL: www.jisea.orgLanguage: English - Date: 2014-08-01 16:58:26
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64 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-06-28 17:23:59
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65 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-04-09 11:03:20
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66 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2013-01-08 11:11:30
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67 | Add to Reading ListSource URL: www.uky.eduLanguage: English - Date: 2008-12-21 12:03:54
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68 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-06-10 15:33:46
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69 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2014-08-14 11:37:08
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70 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2013-11-21 17:53:05
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