TY  - BOOK
AU  - GOPAL, Brij
AU  - Bhardwaj, N.
TI  - Elements of  ecology
SN  -  
U1  - 574.5 
PY  - 1979///
CY  - New Delhi
PB  - Vikas Pub.
KW  - Ecology
KW  - Biology
N1  - includes index
ER  -