00785cam a22002531 4500 e 37000011 DLC 20260227111226.0 830317s1933 fr 000 0 fre c e 37000011 (OCoLC)9317779 U. S. Off. of educ. Library OU DLC premarc L10 .I6952 no. 30 LC142 .I6 International Bureau of Education. Travail et congés scolaires. Genève, Bureau international d'éducation, 1933. 134 p. 24 cm. Publications du Bureau international d'éducation, no. 30 Vacations. School attendance. Publication (International Bureau of Education) ; no. 30. 21506 21506