Hopfen, Hans Joachim. <br/><br/>
Farm implements for arid and tropical regions.   

 - Rev. ed. 
 - Rome :   Food and Agriculture Organization of the United Nations ,   1969. 
 - xii, 159  p. :    illus. ;    23 cm. 
 - FAO agricultural development paper  ;   no. 91 .
<br/><br/>Includes bibliography [147]-150. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural implements.--------
<br/><br/><label>Dewey Class. No.: </label>631.3 HOP