TY  - BOOK
AU  - Lovell,Kenneth
TI  - The growth of basic mathematical and scientific concepts in children / 
U1  - 372.7 LOV 
PY  - 1961///
CY  - London : 
PB  - University of London Press , 
KW  - Arithmetic
KW  - Study and teaching
KW  - Number concepts
KW  - Chils study
ER  -