TY  - BOOK
AU  - Gopal, Brij.
AU  - Bhardwaj, Nagendra
TI  - Elements of ecology
U1  - 574.5 GOP 
PY  - 1979///
CY  - New Delhi
PB  - Vikas Publ. House
KW  - Ecology
N1  - Includes bibliographical references (p.177-196)
ER  -