41 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 10:20:20
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42 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 08:56:59
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43 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-06-12 14:29:04
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44 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-05-07 10:04:34
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45 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 09:52:26
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46 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-02-22 08:10:58
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47 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-11-15 12:22:40
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48 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-06-08 10:51:30
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49 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-05-24 13:53:31
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50 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-06 13:50:36
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