TY  - BOOK
AU  - Venkataiah, S
TI  - Encyclopedia of contemporary education : science education . Vol. 4
SN  - 812610368x
U1  - 370.3 
PY  - 1999///
CY  - New Delhi
PB  - Anmol pub
KW  - Education
KW  - Encylopedia
ER  -