https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22George%2C%20Kenneth%20D.%22&sort_by=title_az&format=rss 3 0 50 ISBN:8429414339 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=7959 ]]> Madrid : Santillana, 1977 .
328 p. 8429414339

]]> Place hold on Las ciencias naturales en la educación básica :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=7959 ISBN:9684306679 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=7960 ]]> México : Santillana, 1992 .
328 p. : 9684306679

]]> Place hold on Las ciencias naturales en la educación básica :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=7960 ISBN:8429414347 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=90863 ]]> By George, Kenneth D..
Madrid : Santillana, 1977 .
220 p. 8429414347

]]> Place hold on La enseñanza de las ciencias naturales :

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