Blackburn, Donald J. <br/><br/>
Foundations and changing practices in extension 

 - 1a. ed. 
 - 159 páginas ; 28 cm. 
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<br/><br/><label>ISBN: </label>0889551421 
<br/><br/><label>Subjects--Topical Terms: </label><br/>TRABAJO DE EXTENSION AGRICOLA
<br/><br/><label>Dewey Class. No.: </label>630.715  / B562f