541 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-05-24 20:14:00
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542 | Add to Reading ListSource URL: www.msha.gov- Date: 2014-07-10 16:41:15
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543 | Add to Reading ListSource URL: www.msha.gov- Date: 2014-07-24 09:56:20
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544 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-06-30 17:02:08
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545 | Add to Reading ListSource URL: www.abandoned-mines.orgLanguage: English - Date: 2013-10-08 09:27:49
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546 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-06-30 17:02:03
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547 | Add to Reading ListSource URL: hewit.unco.eduLanguage: English - Date: 2006-08-08 15:45:14
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548 | Add to Reading ListSource URL: hewit.unco.eduLanguage: English - Date: 2006-08-08 15:47:06
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549 | Add to Reading ListSource URL: hewit.unco.eduLanguage: English - Date: 2003-06-20 12:39:52
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550 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-02-25 10:13:06
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