81 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-01-27 09:01:47
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82 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-01-31 15:04:51
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83 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2004-09-27 10:03:58
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84 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-11 10:53:18
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85 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-01 12:58:17
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86 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 10:22:06
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87 | Add to Reading ListSource URL: www.ehs.org.ukLanguage: English - Date: 2013-06-17 06:06:53
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88 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 11:01:38
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89 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 11:00:57
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90 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 08:59:26
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