Jones, M. J. <br/><br/>
Conservation systems and crop production 

 - 13p.  30cm. 
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservation<br/>Crop production
<br/><br/><label>LC Class. No.: </label>EAF FOS J69.O6