Ruddle, Kenneth <br/><br/>
The Yukpa cultivation system; a study of shifting cultivation in Colombia and Venezuela 

 - Berkeley  University of California press  1974 
 - 197 p  ilus 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CULTIVOS
<br/><br/><label>Subjects--Geographic Terms: </label><br/>COLOMBIA<br/>VENEZUELA