TY  - BOOK
AU  - Phillips, Ronald E.
AU  - Phillips, Shirley H.
TI  - No-tillage agriculture: : principles and practices
U1  - 631.51 
PY  - 1984///
CY  - New York
PB  - Van Nostrand Reinhold
KW  - Labranza cero
KW  - Sistemas de cultivo
ER  -