81 | Add to Reading ListSource URL: www.ulster.ac.ukLanguage: English - Date: 2009-09-22 10:09:21
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82 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-11-29 16:14:49
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83 | Add to Reading ListSource URL: senate.ucsd.eduLanguage: English - Date: 2003-10-09 13:22:34
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84 | Add to Reading ListSource URL: treering.deLanguage: English - Date: 2013-09-21 05:56:22
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85 | Add to Reading ListSource URL: paleosoc.orgLanguage: English - Date: 2012-09-17 21:45:53
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86 | Add to Reading ListSource URL: www.geo.utexas.eduLanguage: English - Date: 2010-03-10 12:46:57
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87 | Add to Reading ListSource URL: www.terrapub.co.jpLanguage: English - Date: 2008-08-20 07:38:06
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88 | Add to Reading ListSource URL: isotopes.usgs.govLanguage: English - Date: 2012-08-27 13:38:49
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89 | Add to Reading ListSource URL: nucleus.iaea.orgLanguage: English - Date: 2011-01-31 09:48:17
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90 | Add to Reading ListSource URL: www.earth.sinica.edu.twLanguage: English - Date: 2007-11-13 03:43:06
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