https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=copydate%3A%221970%20%281993%20impr.%29.%22&sort_by=title_az&format=rss 3 0 50 ISBN:9506180032 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=18067 ]]> By Beck, Lester F..
Buenos Aires : Hormé, 1970 .
87 p. : 9506180032

]]> Place hold on Educación sexual para preadolescentes :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=18067 ISBN:9506180008 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=30289 ]]> By Erikson, Erik Homburger,.
Buenos Aires : Hormé, 1970 .
382 p. 9506180008

]]> Place hold on Infancia y sociedad /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=30289 ISBN:8461010078 | 9505180071 (1993) https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=54618 ]]> By Buckley, Walter.
Buenos Aires : Amorrortu, 1970 .
321 p. 8461010078 | 9505180071 (1993)

]]> Place hold on La sociología y la teoría moderna de los sistemas /

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