Evenson r e <br/><br/>
Crop variety improvement and its effect on productivity: the impact of international agricultural research 

 -  CABI  2003 
 - xxv;522p 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Field crops breedings
<br/><br/><label>Dewey Class. No.: </label>631.5'2  / EVE.C