Hopfen,H.J. <br/><br/>
Farm implements for arid and tropical regions/ 
H.J. Hopfen 
 - Rome  Food and Agriculture Organization of the United Nations  c1960 
 - xii,159p.  ill.  23 cm 
<br/><br/>Includes references:p.147-150 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural implements