000 00403nam a2200109Ia 4500
082 _a370
_bJAY.E
100 _aJayasree, P
245 0 _aExtent of concrete and formal thinking abilities linked to age and environment of high school science students In kerala State /
_cby Jayasree P
260 _aThiruvananthapuram :
_bDept of Education,University of Kerala,
_c1987.
650 _aEducatuion
942 _cTH
999 _c324338
_d324338