TY  - BOOK
AU  - Clarke, George L.
TI  - Elements of ecology
U1  - 577 21st ed.
PY  - 1954///
CY  - New York : 
PB  - John Wiley , 
KW  - Ecology
KW  - Community ecology
KW  - Environmental degradation
KW  - Animal ecology
KW  - Plant ecology
N1  - 505-34 includes index
ER  -