TY  - BOOK
AU  - V.S. RAM DAS
TI  - BIOLOGY (N.C.E.R.T.) CLASS XII
U1  - 570/BIO/V.1 
PY  - 1989///
CY  - NEW DELHI
PB  - NATIONAL COUNSIL OF EDUCATIONAL RESEARCH AND TRAINING
KW  - LIFE SCIENCE
KW  - LIFE SCIENCES; BIOLOGY
ER  -