51 | Add to Reading ListSource URL: cdiac.ornl.govLanguage: English - Date: 2010-05-27 11:34:18
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52 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-07-21 15:45:44
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53 | Add to Reading ListSource URL: www.esrl.noaa.govLanguage: English - Date: 2012-08-31 15:49:41
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54 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-07-21 15:45:43
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55 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-07-21 15:45:45
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56 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-04-12 13:48:54
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57 | Add to Reading ListSource URL: www.esrl.noaa.govLanguage: English - Date: 2011-03-31 15:50:46
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58 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-07-21 15:45:52
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59 | Add to Reading ListSource URL: hc-sc.gc.caLanguage: English - Date: 2013-06-24 08:53:40
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60 | Add to Reading ListSource URL: www.sciencestuff.comLanguage: English - Date: 2013-05-23 10:47:36
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