71 | Add to Reading ListSource URL: dpa.aapg.orgLanguage: English - Date: 2007-08-06 17:04:50
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72 | Add to Reading ListSource URL: www.bsee.govLanguage: English - Date: 2014-01-09 15:49:18
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73 | Add to Reading ListSource URL: www.gnb.caLanguage: English - Date: 2004-07-23 09:49:36
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74 | Add to Reading ListSource URL: www.energy4me.orgLanguage: English - Date: 2010-10-18 18:24:35
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75 | Add to Reading ListSource URL: www.uregina.caLanguage: English - Date: 2014-10-06 16:30:04
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76 | Add to Reading ListSource URL: history.alberta.caLanguage: English - Date: 2013-11-15 13:56:23
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77 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2013-11-13 08:59:38
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78 | Add to Reading ListSource URL: www.kspg.orgLanguage: English - Date: 2005-02-18 15:40:49
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79 | Add to Reading ListSource URL: www.kspg.orgLanguage: English - Date: 2002-03-29 10:27:33
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80 | Add to Reading ListSource URL: online.wr.usgs.govLanguage: English - Date: 2002-03-29 12:16:01
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