41 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-10-12 12:56:43
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42 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-02-19 14:07:04
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43 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-03-06 13:17:08
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44 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-08-05 10:57:07
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45 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-07-11 18:27:30
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46 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-10-05 11:04:26
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47 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-11-01 11:53:57
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48 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-04-04 13:49:26
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49 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-11-01 15:25:56
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50 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-04-13 15:55:34
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