81 | Add to Reading ListSource URL: cals.arizona.eduLanguage: English - Date: 2008-04-17 18:08:28
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82 | Add to Reading ListSource URL: www.cdc.govLanguage: English - Date: 2011-10-19 12:52:02
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83 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2003-12-30 13:52:33
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84 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-08-05 13:12:08
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85 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-04-04 11:19:57
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86 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-01-24 15:10:13
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87 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-15 06:58:00
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88 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 10:54:15
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89 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-07-16 10:51:58
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90 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-01-31 14:50:52
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