Ruddle, Kenneth. <br/><br/>
The Yukpa cultivation system :  a study of shifting cultivation in Colombia and Venezuela / 
by Kenneth Ruddle. 
 - Berkeley :  University of California Press,  1974. 
 - x, 197 p., [11] leaves of plates :  ill. 
 - Ibero-Americana ;  52 .
<br/><br/><label>ISBN: </label>0520094972 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Yupa Indians--Agriculture.<br/>Indians of South America--Agriculture.--Colombia<br/>Indians of South America--Agriculture.--Venezuela<br/>Shifting cultivation.
<br/><br/><label>LC Class. No.: </label>F2319.2.Y8  / R82 
<br/><br/><label>Dewey Class. No.: </label>631.5/8