TY  - BOOK
AU  - Putman R J
AU  - Wratten Stephen D
TI  - Principles of ecology
SN  - 0709920164
AV  - QH541 
PY  - 1985///
CY  - London
PB  - Croom Helm
KW  - Ecology
N1  - Includes bibliography and index
ER  -