Ruthenberg, Hans. <br/><br/>
Farming systems in the tropics 

 - Oxford :  Clarendon,  1971 
 - 313 p.  : ilus. ; láms. 
<br/><br/><label>LCCN: </label>53973 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultura--Trópicos.
<br/><br/><label>Dewey Class. No.: </label>631.0913  / R8