81 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-12-13 10:06:22
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82 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-05-19 15:28:07
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83 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-10-03 16:40:53
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84 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-10-31 15:09:16
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85 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-10-31 15:09:12
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86 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-05-17 08:18:15
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87 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 10:09:48
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88 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-01-24 13:46:00
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89 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 15:39:02
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90 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-05-06 10:24:00
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