Jayasree, P <br/><br/>
Extent of concrete and formal thinking abilities linked to age and environment of high school science students In kerala State / 
by Jayasree P 
 - Thiruvananthapuram :  Dept of Education,University of Kerala,  1987. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educatuion
<br/><br/><label>Dewey Class. No.: </label>370  / JAY.E