71 | Add to Reading ListSource URL: www.icr.orgLanguage: English - Date: 2014-10-21 11:20:17
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72 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2000-06-01 15:52:16
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73 | Add to Reading ListSource URL: ngmdb.usgs.govLanguage: English - Date: 2014-01-18 09:40:02
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74 | Add to Reading ListSource URL: biosurvey.ou.eduLanguage: English - Date: 2014-08-14 12:01:06
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75 | Add to Reading ListSource URL: profile.usgs.govLanguage: English - Date: 2013-07-17 13:21:23
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76 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-05-01 12:16:53
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77 | Add to Reading ListSource URL: d32ogoqmya1dw8.cloudfront.netLanguage: English - Date: 2013-11-21 13:39:58
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78 | Add to Reading ListSource URL: www.dnrec.state.de.usLanguage: English - Date: 2001-09-27 09:37:44
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79 | Add to Reading ListSource URL: www.geology.ar.govLanguage: English - Date: 2013-05-06 16:00:12
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80 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-12-13 13:01:32
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