TY  - BOOK
AU  - Verma,P.S.
AU  - Agarwal,V.K.
TI  - Environmental biology
SN  - 8121908590
U1  - 574.5 VER 
PY  - 1983///
CY  - New Delhi
PB  - S. Chand & Company Limited
KW  - Biology
KW  - Ecology
KW  - Atmosphere and air
KW  - The ecosystem
ER  -