https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Hayes%2C%20Samuel%20Perkins%22&sort_by=title_az&format=rss 2 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=125542 By Hayes, Samuel Perkins.
París : UNESCO, 1959 .
110 p.

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]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=125542 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=138738 By Hayes, Samuel Perkins.
Paris : UNESCO, 1961 .
100 p.

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