R.G. Hurd <br/><br/>
Opportunities for increasing crop yields 

 - Boston  Pitman Advanced publishing Program  1980 
 - 410p 
<br/><br/><br/>ENGLISH 
<br/><br/><label>ISBN: </label>0-27308481-X 
<br/><br/><label>Dewey Class. No.: </label>633  / HUR