21 | Add to Reading ListSource URL: www.stat.washington.eduLanguage: English - Date: 2010-06-07 17:10:15
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22 | Add to Reading ListSource URL: www.econstor.euLanguage: English - Date: 2013-10-31 17:25:50
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23 | Add to Reading ListSource URL: www.econstor.euLanguage: English - Date: 2013-10-31 17:25:50
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24 | Add to Reading ListSource URL: www.niss.orgLanguage: English - Date: 2014-05-06 09:40:15
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25 | Add to Reading ListSource URL: www.idescat.catLanguage: English - Date: 2011-05-31 08:22:22
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26 | Add to Reading ListSource URL: stats.bls.govLanguage: English - Date: 2003-11-10 17:43:39
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27 | Add to Reading ListSource URL: nass.usda.govLanguage: English - Date: 2011-02-08 14:55:30
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28 | Add to Reading ListSource URL: nass.usda.govLanguage: English - Date: 2011-02-08 14:56:05
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29 | Add to Reading ListSource URL: cran.r-project.orgLanguage: English - Date: 2014-09-12 01:51:59
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30 | Add to Reading ListSource URL: www.ciqss.umontreal.caLanguage: English - Date: 2005-12-16 10:17:48
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