TY  - BOOK
ED  - NCERT
TI  - Biology : : text book for higher secondary schools class xi - xii
U1  - 574 N231 B 
PY  - 1986///
CY  - New Delhi
PB  - : NCERT, 
KW  - Biology - Textbook for schools
KW  - | Animal - Anatomy
KW  - | Plants - Anatomy - Physiology
KW  - | Man and environment
ER  -