81 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 09:03:11
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82 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-22 13:13:29
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83 | Add to Reading ListSource URL: www.cafam.orgLanguage: English - Date: 2014-05-23 19:18:13
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84 | Add to Reading ListSource URL: vnrc.orgLanguage: English - Date: 2013-02-21 12:55:01
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85 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 12:08:19
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86 | Add to Reading ListSource URL: www.extension.orgLanguage: English - Date: 2011-04-05 19:16:44
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87 | Add to Reading ListSource URL: www.whyy.orgLanguage: English - Date: 2013-09-19 11:01:50
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88 | Add to Reading ListSource URL: www.unlv.eduLanguage: English - Date: 2012-01-09 11:56:35
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89 | Add to Reading ListSource URL: www.ose.state.nm.usLanguage: English - Date: 2012-02-10 13:24:00
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90 | Add to Reading ListSource URL: dnr.alaska.govLanguage: English - Date: 2013-11-18 14:57:08
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