TY  - BOOK
AU  - BILLINGS, W D
TI  - Plants man and the ecosystem
T2  - Fundamentals of botany series
U1  - 581.5 
PY  - 1964///
CY  - London
PB  - Macmillan
KW  - Ecology
KW  - Ecosystem
KW  - Phytogeography
ER  -