https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AEducational%20Testing%20Service%2C&sort_by=title_az&format=rss 3 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=18480 Princeton (E.U.A.) : Educational Testing Service, 1976 .
xv, 95 p. :

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=18480 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=60797 Educational Testing Service, Test Collection

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=60797 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=46953 Princenton, N. J. : Educational Testing Service, 1971 .
ix, 173 p. :

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