TY  - BOOK
AU  - K. Lovell
TI  - The Growth of basic mathematical and scientific concepts in children
SN  - 0340083816
U1  - 372.7 L899g 
PY  - 1971///
CY  - London
PB  - University of london
KW  -  Number concept in children
KW  -  Conservation (Psychology)
ER  -