TY  - BOOK
AU  - Billings,W.D.(William Dwight),1910-
TI  - Plants, man, and the ecosystem
PY  - 1970///
CY  - Belmont, Ca.
PB  - Wadsworth Publishing Co.
KW  - Botany
KW  - Ecology
N1  - First and 3rd ed. pub. under title: Plants and the ecosystem; p. 149-151
ER  -