51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-05-07 07:00:24
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52 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-07-24 17:12:15
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53 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-02-26 09:00:17
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54 | Add to Reading ListSource URL: www.sierra-leone.orgLanguage: English - Date: 2011-08-22 18:24:09
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55 | Add to Reading ListSource URL: www.miningwatch.caLanguage: English - Date: 2011-07-15 11:49:41
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56 | Add to Reading ListSource URL: www.sudburysoilsstudy.comLanguage: English - Date: 2008-11-10 15:02:59
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57 | Add to Reading ListSource URL: www.pollutionprobe.orgLanguage: English - Date: 2011-02-09 11:59:41
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58 | Add to Reading ListSource URL: www.lsuc.on.caLanguage: English - Date: 2005-07-21 11:25:38
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59 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-06-27 16:32:28
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60 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-02-12 16:31:36
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