TY  - BOOK
AU  - Pyenson Louis L
TI  - Element of plant protection
U1  - J:4:5, J1-;1 
PY  - 1951///
CY  - New York    
PB  -  John Wiley       
KW  - Agriculture
N1  - Appendix 488-492p; Glossary 493-501p
ER  -