31 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-07-21 15:45:42
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32 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-02-01 09:22:59
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33 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-02-02 09:14:32
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34 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-01-19 09:25:40
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35 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-01-27 10:01:48
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36 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 13:38:34
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37 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-05-01 10:10:16
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38 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1998-02-26 08:36:17
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39 | Add to Reading ListSource URL: thinkglobal.usLanguage: English - Date: 2014-06-23 16:40:14
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40 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1996-08-08 11:06:43
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