TY  - BOOK
AU  - Plaget, Jean
TI  - The child's Conception of Number
U1  - 155.41323 
PY  - 1965///
CY  - London
PB  - Routledge & Kegan Paul Ltd
KW  - Number Concept in Children
KW  - Number Concept
KW  - Child Psychology
N1  - includes Index
ER  -