Evenson, Robert Edward <br/><br/>
Extension, technology, and efficiency in agriculture in Sub-Saharan Africa 

 - New Haven  Yale University  1997 
 - 105-119p.  28cm. 
<br/><br/> Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture
<br/><br/><label>LC Class. No.: </label>HD2117.C56