81 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-07-02 13:58:29
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82 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2003-02-19 10:54:06
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83 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-05-19 15:28:06
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84 | Add to Reading ListSource URL: www.netl.doe.govLanguage: English - Date: 2013-07-10 19:08:10
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85 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-09-23 10:53:15
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86 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-01-24 14:45:06
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87 | Add to Reading ListSource URL: www.netl.doe.govLanguage: English - Date: 2013-08-07 22:00:39
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