https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=pl%3A%22Washintong%20%3A%22&sort_by=title_az&format=rss 2 0 50 ISBN:1580871275 (10 dígitos) | 9781580871273 (13 dígitos) https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=192153 Washintong, D.C. : National Geographic Society, 2008 .
60 p. : 1580871275 (10 dígitos) | 9781580871273 (13 dígitos)

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=192153 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=139558 Washintong : Secretaría de Educación de los Estados Unidos, 1987 .
80 p. :

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