1 | Add to Reading ListSource URL: www.nasonline.orgLanguage: English - Date: 2012-07-18 10:54:48
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2 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2006-10-31 08:52:30
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3 | Add to Reading ListSource URL: www.geosociety.orgLanguage: English - Date: 2013-07-26 17:05:05
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4 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-12-18 16:55:56
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5 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2013-06-19 12:07:13
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6 | Add to Reading ListSource URL: www.geosociety.orgLanguage: English - Date: 2013-06-19 12:07:13
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7 | Add to Reading ListSource URL: www.amerisurv.comLanguage: English - Date: 2007-10-25 13:55:55
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8 | Add to Reading ListSource URL: books.nap.eduLanguage: English - Date: 2010-07-01 06:57:41
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9 | Add to Reading ListSource URL: www.nap.eduLanguage: English - Date: 2005-09-28 06:30:56
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10 | Add to Reading ListSource URL: affiliations.si.eduLanguage: English - Date: 2009-05-26 12:55:12
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