21 | Add to Reading ListSource URL: www.sofia.usra.eduLanguage: English - Date: 2009-06-08 14:04:53
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22 | Add to Reading ListSource URL: www.michiganassessmentconsortium.orgLanguage: English - Date: 2013-07-02 10:27:45
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23 | Add to Reading ListSource URL: www2.sims.berkeley.eduLanguage: English - Date: 2002-05-19 11:16:47
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24 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-08-05 13:17:47
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25 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2014-08-05 13:17:47
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26 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-08-05 13:17:47
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27 | Add to Reading ListSource URL: www.nixonlibrary.govLanguage: English - Date: 2007-04-04 10:49:19
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28 | Add to Reading ListSource URL: www.nasa.govLanguage: English - Date: 2013-04-30 20:23:36
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29 | Add to Reading ListSource URL: ns2.virusflags.dc.huLanguage: English - Date: 2008-06-08 11:28:53
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30 | Add to Reading ListSource URL: pielkeclimatesci.files.wordpress.comLanguage: English - Date: 2010-02-12 12:18:25
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