71 | Add to Reading ListSource URL: www.infomine.comLanguage: English - Date: 2015-03-31 22:38:05
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72 | Add to Reading ListSource URL: www.eia.govLanguage: English - Date: 2015-04-10 09:25:58
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73 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2015-03-23 15:58:01
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74 | Add to Reading ListSource URL: www.ardentresources.com.auLanguage: English - Date: 2014-09-11 23:41:38
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75 | Add to Reading ListSource URL: www.smithsonianchannel.comLanguage: English - Date: 2015-03-16 11:43:23
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76 | Add to Reading ListSource URL: www.eia.govLanguage: English - Date: 2014-12-04 11:32:47
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77 | Add to Reading ListSource URL: www.prweb.comLanguage: English - Date: 2013-05-10 05:02:07
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78 | Add to Reading ListSource URL: www.eia.govLanguage: English - Date: 2012-09-26 10:54:41
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79 | Add to Reading ListSource URL: www.eia.govLanguage: English - Date: 2014-12-04 11:11:25
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80 | Add to Reading ListSource URL: www.ndsu.eduLanguage: English - Date: 2014-12-14 11:21:11
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