https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3ASEP%2C%20DGETI%2C&sort_by=title_az&format=rss 2 0 50 ISBN:9682980550 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=160175 ]]> México : SEP, DGETI, 1995 .
81 p. 9682980550

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=160175 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=160178 México : SEP, DGETI, 2005 .
56 p.

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