511 | Add to Reading ListSource URL: prc.coh.orgLanguage: English - Date: 2001-07-02 17:40:36
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512 | Add to Reading ListSource URL: ncsesdata.nsf.govLanguage: English - Date: 2015-04-02 14:35:31
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513 | Add to Reading ListSource URL: dpb.cornell.eduLanguage: English - Date: 2014-12-03 16:40:28
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514 | Add to Reading ListSource URL: www.upf.eduLanguage: English - Date: 2015-01-15 07:08:31
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515 | Add to Reading ListSource URL: www.baltex-research.euLanguage: English - Date: 2008-05-13 08:01:19
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516 | Add to Reading ListSource URL: hr.sites.unc.eduLanguage: English - Date: 2013-01-22 12:55:53
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517 | Add to Reading ListSource URL: unstats.un.orgLanguage: English - Date: 2003-09-03 16:43:18
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518 | Add to Reading ListSource URL: home.isr.umich.eduLanguage: English - Date: 2013-01-25 10:16:10
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519 | Add to Reading ListSource URL: www.pices.intLanguage: English - Date: 2010-03-25 16:19:56
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520 | Add to Reading ListSource URL: www.ferrykoster.nlLanguage: English - Date: 2010-02-16 05:53:59
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