https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=copydate%3A%221969%20%281974%20impr.%29.%22&sort_by=title_az&format=rss 3 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=124876 México : Grolier, 1969 .
10 v.

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=124876 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=40764 By Pinto, Luis de Aguilar Costa.
México : Siglo XXI, 1969 .
127 p.

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=40764 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=59005 By Hodges, Mary.
London : Neson, 1969 .
96 p. : , "Libro dos de World history"

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