TY  - BOOK
AU  - Verma,P.S, Agarwal, V.K
AU  - x
TI  - Concepts of ecology: (Environmental biology)
SN  - 81219168 1
U1  - 577/V522c 
PY  - 1999///
CY  - New Delhi
PB  - S.chand
KW  - Ecology
N1  - Includes
ER  -