https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AUniversity%20Microfilms%20International&sort_by=title_az&format=rss 4 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=59787 Ann Arbor, Michigan, Est : University Microfilms International, 1969

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=59787 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=59788 EUA : University Microfilms International

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=59788 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=59789 EUA : University Microfilms International

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=59789 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=60027 USA : American Educational Studies Association : University Microfilms International, 1970

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