TY  - BOOK
ED  - International Conference on Public Education
TI  - Introduction to natural science in primary school
AV  - L10 I69 no.111
PY  - 1949///
CY  - Geneva
PB  - International Bureau of Education, UNESCO
KW  - Ciencias naturales
KW  - Estudio y enseñanza (Elemental)
KW  - Educación
ER  -