TY  - GEN
AU  - Verma, P. S.
AU  - Agarwal, V.K.
TI  - Environmental Biology : Principles of ecology
SN  -  81-219-0859-0
U1  - 363.574 
PY  - 2013///
CY  - New Delhi
PB  - S. Chand & co.
KW  - ENVIRONMENTAL SCIENCE
KW  - BIOLOGY
ER  -