TY  - BOOK
AU  - VERMA,P.S.
AU  - AGARWAL, V.K
TI  - Principles of ecology: environmntal biology
U1  - ZOO 574.5 
PY  - 1989///
CY  - New Delhi
PB  - S.Chand
KW  -  ECOLOGY
N1  - Includes contains Glossary and bibliography
ER  -