Hofpen, Hans Joachim <br/><br/>
Farm implements for arid and tropical regions 
prepared by H.J. Hopfen 
 - Rome:  Food and Agriculture Organization of the United Nations  c1969 
 - xii, 146 pages  illustrations  23 cm. 
 - FAO agricultural development paper: no. 91 .
<br/><br/> Bibliography: pages. 147-150 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural implements