TY  - BOOK
AU  - Jayasree, P
TI  - Extent of concrete and formal thinking abilities linked to age and environment of high school science students In kerala State
U1  - 370 
PY  - 1987///
CY  - Thiruvananthapuram
PB  - Dept of Education,University of Kerala
KW  - Educatuion
ER  -