TY  - BOOK
AU  - WEBSTER H SILL
TI  - THE PLANT PROTECTION DISCIPLINE
SN  - 0470 26443 8
U1  - GN 632.9SI 35 P 
PY  - 1978///
CY  - NEW YORK
PB  - JOHN WILEY & SONS
KW  - PLANT PROTECTION
ER  -