Hurd, R G <br/><br/>
Opportunities for increasing crop yields 
/ edited by  R G Hurd 
 - London:  Pitman,  1980. 
 - 410p. 
<br/><br/><label>ISBN: </label>027308481X 
<br/><br/><label>Dewey Class. No.: </label>631.558  / HUR/O