https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AOscar%20Ren%C3%A9%20Cruz%20O.&sort_by=title_az&format=rss 2 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=7768 México : Oscar René Cruz O. 1976 .
288 p.

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=7768 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=11971 By Humboldt, Alexander von,.
México : Oscar René Cruz O., 1976 .
147, 187 p , Editado "por encargo del Gobierno Federal" | Dos tomos en un volumen

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