51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-11-21 17:01:11
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52 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2006-03-23 14:37:54
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53 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-05-26 12:13:49
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54 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 15:28:38
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55 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-10-25 11:25:21
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56 | Add to Reading ListSource URL: tfeip-secretariat.orgLanguage: English - Date: 2012-05-10 05:29:49
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57 | Add to Reading ListSource URL: ec.europa.euLanguage: English - Date: 2014-05-13 12:11:23
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58 | Add to Reading ListSource URL: ec.europa.euLanguage: English - Date: 2014-06-23 05:36:19
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59 | Add to Reading ListSource URL: www.herty.comLanguage: English - Date: 2014-01-16 15:21:23
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60 | Add to Reading ListSource URL: www.plastics.glLanguage: English - Date: 2014-06-06 21:58:46
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