TY  - BOOK
AU  - Sill Webster H
TI  - Plant protection discipline: Problems and possible developmental strategies
U1  - J:4:5, L8;M2 
PY  - 1982///
CY  - Ames Iowa 
PB  - State University Press      
KW  -  Plant disease
KW  -  Plant protection
KW  - Agriculture
ER  -