TY  - BOOK
AU  - Keen, F. P.
TI  - Insects enemies of western forest
T2  - U.S. Dept. of Agriculture. Misc. Pub
U1  - 634.967 
PY  - 1952///
CY  - Washington
PB  - Government Printing Office
KW  - Árboles
KW  - Plagas
KW  - E.U.A
ER  -