Simmonds, N.W. <br/><br/>
Principles of crop improvement 
/by N.W.Simmonds 
 - London  Longman  1979 
 - xiv, 408 pages 
<br/><br/><label>ISBN: </label>0582446309 
<br/><br/><label>ISSN: </label>84237 
<br/><br/><label>Dewey Class. No.: </label>631.522  / SIM