TY  - BOOK
AU  - Lovell,K.
AU  - Inhelder,Barbel
TI  - The growth of basic mathematical and scientific concepts in children / 
U1  - 372.7 LOV 
PY  - 1968///.
CY  - London : 
PB  - London University Press, 
KW  - Elementary education
KW  - Conservation (Psychology)
KW  - Number concept in children
KW  - Arithmetic--Study and teaching (Elementary)
KW  - Child development
KW  - Child psychology
N1  - Includes index.
ER  -