"International Conference on Public Education (31 : 1968 : Geneva)" . . . "Vergelykende opvoedkunde." . . "International Conference on Public Education (31st : 1968 : Geneva)" . . . "International Conference on Public Education" . . . "International Bureau of Education (Geneva)" . . "Gemeenskap en skool." . . . . "Milieu scolaire." . . "School environment." . . "International Conference on Public Education (31 ; 1968 ; Genewa)." . . . "International conference on public education, 31st, Geneva, 1968." . . . . . . . . . . . "The study of environment in school"@en . "The study of environment in school" . "The study of environment in school Research in comparative education"@en . . . "The study of environment in school : research in comparative education" . . . "The study of environment in school : Research in comparative education" . "The study of environment in school : Research in comparative education"@en . . . . "The Study of environment in school" . . . . . . . . . . . . "Opsomming van landen die milieu-opleidingen, of studies die met milieu te maken hebben, verzorgen." . . . . . . . . "The study of environment in school : research in comparative education : XXXIst session of the International Conference on Public Education, Geneva, 1968"@en . "The study of environment in school. Research in comparative education" . . . . . . . . "The study of environment in school; research in comparative education"@en . . . "The study of environment in school : research in comparative education : XXXIth session of the International Conference on Public Education, Geneva 1968" . . "Éducation comparée." . . "Comparative education." . . "United Nations Educational, Scientific and Cultural Organization." . . "International Conference on Public Education (31ste : 1968 : Geneva, Switzerland)" . . . "Conférence internationale de l'instruction publique (31e : 1968 : Genève)" . . .