Ruthenberg, Hans. <br/><br/>
Farming systems in the tropics / 
Hans Ruthenberg. 
 - Oxford :  Clarendon Press,  1980. 
 - xxii, 424 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliography and index. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>019859481X 
<br/><br/><label>LCCN: </label>7941135  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural systems--Tropics.<br/>Farm management--Tropics.