61 | Add to Reading ListSource URL: www.mgs.md.govLanguage: English - Date: 2013-10-01 08:42:08
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62 | Add to Reading ListSource URL: dpa.aapg.orgLanguage: English - Date: 2007-07-03 15:10:19
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63 | Add to Reading ListSource URL: www.mgs.md.govLanguage: English - Date: 2013-10-01 08:42:27
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64 | Add to Reading ListSource URL: www.georgewright.orgLanguage: English - Date: 2012-03-01 12:03:33
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65 | Add to Reading ListSource URL: www.lpi.usra.eduLanguage: English - Date: 2002-05-06 13:37:25
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66 | Add to Reading ListSource URL: people.bu.eduLanguage: English - Date: 2010-11-09 12:09:21
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67 | Add to Reading ListSource URL: web.geology.ufl.eduLanguage: English - Date: 2013-08-12 14:41:55
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68 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-04-26 16:23:18
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69 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2009-01-27 11:47:20
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70 | Add to Reading ListSource URL: web.geology.ufl.eduLanguage: English - Date: 2012-10-07 17:09:47
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