TY  - BOOK
AU  - Unger, Paul W.
TI  - Tillage system for Soil and water conservation
U1  - 631.451 21st ed.
PY  - 1984///
CY  - Rome
PB  - Food and Agriculture Organization of the United Nations
KW  - Agriculture
KW  - Soil conservation
KW  - Tillage
KW  - Water conservation
ER  -