TY  - BOOK
AU  - Piaget,Jean
TI  - The child's conception of number / 
T2  - International library of psychology, philosophy, and scientific method
U1  - 155.41323  23 
PY  - 1952///
CY  - New York
PB  - Humanities Press, 
KW  - Child psychology
KW  - Number concept
N1  - Translation of La gen�se du nombre chez l'enfant
ER  -