21 | Add to Reading ListSource URL: www.popcenter.orgLanguage: English - Date: 2008-01-07 15:00:53
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22 | Add to Reading ListSource URL: kopal.langzeitarchivierung.deLanguage: German - Date: 2014-05-19 05:32:47
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23 | Add to Reading ListSource URL: kopal.langzeitarchivierung.deLanguage: German - Date: 2014-05-15 10:07:19
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24 | Add to Reading ListSource URL: www.nber.orgLanguage: English - Date: 2004-08-27 10:30:15
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25 | Add to Reading ListSource URL: www.nber.orgLanguage: English - Date: 2011-12-05 15:41:08
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26 | Add to Reading ListSource URL: www.doaks.orgLanguage: English - Date: 2012-03-12 21:30:42
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27 | Add to Reading ListSource URL: www.nber.orgLanguage: English - Date: 2007-03-09 16:23:58
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28 | Add to Reading ListSource URL: www.nber.orgLanguage: English - Date: 2005-10-26 08:54:36
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29 | Add to Reading ListSource URL: scholar.harvard.eduLanguage: English - Date: 2013-02-05 00:41:18
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30 | Add to Reading ListSource URL: scholar.harvard.eduLanguage: English - Date: 2013-05-20 13:54:44
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