TY  - BOOK
AU  - Verma, P.S
AU  - Agarwal, V.K
TI  - Environmental biology: principles of ecology
SN  - 9788121908597
U1  - 574.5 VER 
PY  - 2015///
CY  - New Delhi
PB  - S.Chand
KW  - Biology - Environmental science
ER  -