SIMMONDS W.N. <br/><br/>
PRINCIPLES OF CROP IMPROVEMENT  

 - LONDON  LONGMAN  1979 
<br/><br/><label>ISBN: </label>0 582 44630 9 
<br/><br/><label>LC Class. No.: </label>631.53/SIM  / 4 
<br/><br/><label>Dewey Class. No.: </label>631.53/SIM  / 4