TY  - GEN
AU  - Verma,  P.S.
AU  - Pandey, B.P.
TI  - A text book of biology Vol; II: for class XII of central board of secondary education
U1  - 570 
PY  - 1989///
CY  - New Delhi
PB  - S.Chand 
KW  - BIOLOGY
ER  -