TY  - BOOK
AU  - Yothers, M.A.
TI  - Biology and control of tree hoppers injurious to fruit trees in the pacific northwest
U1  - PA-C 634 N4 1933 
CY  - Washington, D.C.
PB  -  USDA
KW  - Arboles
KW  -  plagas
KW  - Arboles frutales
KW  - Control biológico de plagas
N1  - Encuadernado con : Orchard insects... / by E.J. Newcomer
ER  -