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

 - 2nd ed. 
 - Oxford  Clarendon press  1976 
 - xviii,366p.; 22cm. 
<br/><br/><label>ISBN: </label>198594615 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cultivation systems<br/>Farming - tropics<br/>Irrigation farming<br/>Tropical environment