TY  - BOOK
AU  - Boa,E.R.
ED  - Food and Agriculture Organization of the United Nations.
TI  - An illustrated guide to the state of health of trees : : recognitio n and interpretation of symptoms and damage / 
SN  - 9251050201
PY  - 2003///
CY  - Rome : 
PB  - Food and Agriculture Organization of the United Nations, 
KW  - Trees
KW  - Diseases and pests
N1  -  Includes bibliography : p. 41-45
ER  -