Unger, Paul W. <br/><br/>
Tillage systems for soil and water conservation / 
by Paul W. Unger. 
 - Rome :  FAO,  1984. 
 - xvi, 278 p. :  ill. 
 - FAO soils bulletin ;  54 .
<br/><br/>Contains bibliography: p. 241-270. 
<br/><br/><label>ISBN: </label>9251021546 
<br/><br/><label>LCCN: </label>92013241     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tillage.<br/>Cropping systems.<br/>Conservation tillage.<br/>Soil conservation.<br/>Water conservation