TY  - GEN
AU  - Verma, P. S.
AU  - Agarwal, V. K.
TI  - Concept of ecology: environmental biology
SN  - 812191681X
U1  - 577 
PY  - 1998///
CY  - New Delhi
PB  - S. Chand & Company Ltd
KW  - Ecology
KW  - Life sciences  Biology
ER  -