TY  - BOOK
AU  - Verma, P. S.
AU  - Agarwal, V. K.
TI  - Environmental biology: principles of ecology
SN  - 81-219-0859-0
U1  - 504:57 
PY  - 2004///
CY  - New Delhi
PB  - S. Chand & Co.
KW  - Environmental biology
KW  - Biology- Environment
ER  -