TY  - BOOK
AU  - 
AU  - B.D.Singh & etc
ED  - National,
TI  - Biology: a textbook for class xii 
SN  - 8174501811
U1  - G P 570.7 23rd ed.
PY  - 2003///
CY  - New Delhi
PB  - National Council of Educational Research and Training
KW  - Biology -
KW  - Study and teaching
ER  -