591 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-01-27 09:01:47
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592 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2001-05-07 14:16:48
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593 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2001-05-07 14:16:44
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594 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 09:01:40
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595 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-01-31 15:04:51
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596 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-05-13 13:35:36
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597 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 09:55:40
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598 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-10-23 07:10:42
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599 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-02-28 14:47:44
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600 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2010-03-24 17:21:04
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