Simmonds, N.W. <br/><br/>
Principles of crop improvement 
/ N.W.Simmonds 
. - London  : Longman Group Limited, 1979
. - xiv-408p.  : couv.en coul.  ; 22 cm 
<br/><br/><label>ISBN: </label>582-45586-3   0-582-44630-9 
<br/><br/><label>Source: </label>162959 
<br/><br/><label>Universal Decimal Class. No.: </label>631.1.