TY  - BOOK
AU  - Ashton, Floyd M.
AU  - Monaco, Thomas J.
TI  - Weed cience: principles and practices  
U1  - PA 632.58 A84 1991 
CY  - New York
PB  -  Wiley
KW  - Herbicidas
KW  - Malas hierbas
KW  -  control
ER  -