Evenson, R. E. Gollin, D. <br/><br/>
Crop variety improvement and its effect on productivity  The impact of agricultural research. 
R. E. Evenson & D. Gollin. 
 - Willingford, UK.  CABI Publishing.  2003 
 - xxv, 522p.:  illus; Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0851995497 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Field crops--Breeding.<br/>Field crops--Genetics.<br/>Crop improvement.<br/>Agriculture--Research--International cooperation.<br/>Agricultural productivity.