61 | Add to Reading ListSource URL: nature.nps.govLanguage: English - Date: 1998-09-02 03:00:00
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62 | Add to Reading ListSource URL: phys.orgLanguage: English - Date: 2014-11-26 11:50:59
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63 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-01-08 10:16:05
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64 | Add to Reading ListSource URL: www.glsc.usgs.govLanguage: English - Date: 2013-07-31 17:43:21
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65 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2009-11-10 14:49:48
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66 | Add to Reading ListSource URL: uw.physics.wisc.eduLanguage: English - Date: 2011-07-25 10:34:48
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67 | Add to Reading ListSource URL: profiles.nlm.nih.govLanguage: English - Date: 2001-11-14 18:36:05
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68 | Add to Reading ListSource URL: www.pragma-ade.nlLanguage: English - Date: 2010-05-06 11:53:26
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69 | Add to Reading ListSource URL: nas-sites.orgLanguage: English - Date: 2014-04-01 08:50:52
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70 | Add to Reading ListSource URL: www.nobelprize.orgLanguage: English - Date: 2006-05-31 16:46:58
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