31 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:11
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32 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-07-23 09:36:48
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33 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-06-06 17:02:51
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34 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-07-01 16:15:21
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35 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:11
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36 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-07-23 09:37:47
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37 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-01-09 11:00:28
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38 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 08:58:53
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39 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 10:35:11
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40 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-26 08:07:08
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