TY  - BOOK
AU  - Verma P S.
AU  - Agarwal, V.K.
TI  - Environmental Biology: principles of ecology
SN  - 9788121908597
AV  - QH308 VER 
U1  - 574.5  
PY  - 2007///
CY  - New Delhi
PB  - S Chand & Company Limited
ER  -