101 | Add to Reading ListSource URL: www.chemguide.co.ukLanguage: English - Date: 2012-12-03 11:53:02
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102 | Add to Reading ListSource URL: astro.unl.eduLanguage: English - Date: 2009-09-14 16:34:10
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103 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2010-07-21 15:50:42
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104 | Add to Reading ListSource URL: www.pma.caltech.eduLanguage: English - Date: 2011-10-10 20:21:45
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105 | Add to Reading ListSource URL: www.cfa.harvard.eduLanguage: English - Date: 2014-06-11 11:54:10
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106 | Add to Reading ListSource URL: www2.epa.govLanguage: English - Date: 2013-04-15 08:51:50
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107 | Add to Reading ListSource URL: www2.epa.govLanguage: English - Date: 2013-04-15 08:52:21
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108 | Add to Reading ListSource URL: www.cpepphysics.orgLanguage: English - Date: 2013-09-10 21:21:02
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109 | Add to Reading ListSource URL: www.physicscentral.org- Date: 2008-04-11 15:27:37
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110 | Add to Reading ListSource URL: aim.hamptonu.eduLanguage: English - Date: 2009-08-07 12:27:00
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