https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Contreras%2C%20Elsa%2C%22&sort_by=title_az&format=rss 6 0 50 ISBN:968804196 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=20770 México : SEP : | CEMPAE, 1980 .
323 p. : , "Libro de texto gratuito" 968804196

]]> Place hold on Español :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=20770 ISBN:9688040436 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=20798 ]]> México : CEMPAE : | SEP, Comisión Nacional delos Libros de Texto Gratuitos, 1979 .
254 p. : , Libro de texto gratuito 9688040436

]]> Place hold on Español :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=20798 ISBN:9688041351 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=20813 ]]> México : CEMPAE$bSEP, 1980 .
271 p. : , Libro de texto gratuito 9688041351

]]> Place hold on Español :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=20813 ISBN:9682449049 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=23981 ]]> By Contreras, Elsa.
México : Trillas, 1993 .
198 p. : 9682449049

]]> Place hold on Expresión y apreciación artísticas :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=23981 ISBN:9684080913 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=46480 ]]> By Contreras, Elsa.
México : Edicol, 1980 .
87 p. 9684080913

]]> Place hold on Principios de tecnología educativa /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=46480 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=120279 México : CEMPAE, 1979 .
18 p.

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