71 | Add to Reading ListSource URL: www.aogc.state.ar.usLanguage: English - Date: 2013-02-12 15:07:55
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72 | Add to Reading ListSource URL: inlandgeo.orgLanguage: English - Date: 2009-05-02 02:23:06
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73 | Add to Reading ListSource URL: www.aapg.orgLanguage: English - Date: 2016-07-19 17:34:42
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74 | Add to Reading ListSource URL: geology.okstate.eduLanguage: English - Date: 2015-03-13 10:12:31
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75 | Add to Reading ListSource URL: mtac.isws.illinois.eduLanguage: English - Date: 2009-04-08 16:41:11
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76 | Add to Reading ListSource URL: ky.water.usgs.govLanguage: English - Date: 2013-12-11 10:30:22
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77 | Add to Reading ListSource URL: www.geology.ar.govLanguage: English - Date: 2013-02-27 15:47:42
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78 | Add to Reading ListSource URL: www.wvsoro.orgLanguage: English - Date: 2008-12-09 15:03:24
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79 | Add to Reading ListSource URL: www.trgs.orgLanguage: English - Date: 2016-03-15 16:45:00
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80 | Add to Reading ListSource URL: www.dhr.virginia.govLanguage: English - Date: 2012-08-03 12:30:23
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