71 | Add to Reading ListSource URL: ehs.columbia.eduLanguage: English - Date: 2014-01-17 14:45:21
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72 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:05
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73 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:06:59
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74 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 11:50:30
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75 | Add to Reading ListSource URL: mining.state.co.usLanguage: English - Date: 2014-05-27 11:29:05
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76 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-07-03 14:10:54
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77 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-11-09 11:20:56
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78 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 16:32:30
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79 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-03-29 16:15:00
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80 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 11:21:36
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