Simmonds, N. W. <br/><br/>
Principles of crop improvement / 
Norman Willison Simmonds. 
 - London :  Longman,  1979. 
 - xiv, 408 p.:  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references (p.369-399) and index. 
<br/><br/><label>ISBN: </label>0582407370 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plant breeding.
<br/><br/><label>Dewey Class. No.: </label>631.53