TY  - BOOK
AU  - Pyenson,Louis
TI  - Elements of plant protection
T2  - Wiley farm series
AV  - SB601 .P9
U1  - 632 
PY  - 1951///
CY  - New York
PB  - Wiley
KW  - Agricultural pests
N1  - "Selected reference books": p. 488-491
ER  -