41 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-09-27 11:18:56
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42 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2006-03-23 14:37:56
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43 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-07-18 12:52:17
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44 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-04-01 14:58:40
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45 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-02-07 15:29:58
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46 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-18 14:12:35
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47 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-12-19 17:11:26
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48 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-04-15 12:19:02
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49 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-01-07 16:50:45
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50 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-05-31 18:17:56
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