TY  - BOOK
AU  - Verma, P. S.
AU  - 
AU  - Agarwal, V. K.
TI  - Environmental biology: principles of ecology
SN  - 8121908590
U1  - 577 
PY  - 2000///
CY  - New Delhi
PB  - S. chand
KW  - Ecology
N1  - Includes index
ER  -