71 | Add to Reading ListSource URL: www.coastal.ca.govLanguage: English - Date: 2013-01-25 16:34:56
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72 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-10-03 11:02:25
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73 | Add to Reading ListSource URL: www.energy.alberta.caLanguage: English - Date: 2013-10-31 18:13:46
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74 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:00:13
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75 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1998-12-01 06:28:52
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76 | Add to Reading ListSource URL: www.geology.arkansas.govLanguage: English - Date: 2009-12-04 11:05:56
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77 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-11-09 11:22:29
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78 | Add to Reading ListSource URL: mining.state.co.usLanguage: English - Date: 2014-05-27 11:24:42
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79 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2007-11-27 17:23:16
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80 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-04-11 14:40:10
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