Hughes, H.D.  <br/><br/>
Crop production  (Book) 

 - 3rd ed. 
 - New York  Macmillan  1972 
 - 627 p.  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Field crops. Production
<br/><br/><label>Universal Decimal Class. No.: </label>633 HUG  / 2481