51 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:09
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52 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-03-06 13:09:47
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53 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-02-26 08:04:27
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54 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:01
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55 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:09
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56 | Add to Reading ListSource URL: www.nrel.govLanguage: English - Date: 2013-10-02 15:44:33
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57 | Add to Reading ListSource URL: www.aps.orgLanguage: English - Date: 2011-02-17 17:20:19
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58 | Add to Reading ListSource URL: www.stefan-seelmann.deLanguage: English - Date: 2013-10-13 10:40:43
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59 | Add to Reading ListSource URL: publications.jrc.ec.europa.euLanguage: English - Date: 2012-04-17 05:42:56
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60 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-10-05 11:48:04
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