Stephen R. Chapman <br/><br/>
Crop production : Principles and practices 

 - San Francisco  W H Freeman & Company  1976 
 - 565p 
<br/><br/><br/>ENGLISH 
<br/><br/><label>ISBN: </label>0-7167-0581-8 
<br/><br/><label>Dewey Class. No.: </label>633  / CHA