TY  - BOOK
AU  - Billings,W.D.(William Dwight),1910-
TI  - Plants, man, and the ecosystem
SN  - 0333146336
PY  - 1972///
CY  - London
PB  - MacMillan.
KW  - Botany
KW  - Ecology0
N1  - Bibliography: p. 149-151
ER  -