481 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2009-10-19 13:24:21
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482 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-02-14 10:54:25
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483 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-05-06 10:24:00
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484 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-11-15 12:22:34
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485 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-11-14 11:27:28
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486 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-03-07 08:11:48
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487 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-11-14 11:27:29
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488 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-01-29 14:31:06
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489 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-01-18 09:44:28
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490 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2009-10-19 13:36:10
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