Cock, James (ed.) <br/><br/>
Proceedings of the Fourth Symposium of the Interanational Society for Tropical Root Crops 

 - Box 8500, Ottawa, Canada K1G 3H9  International Development Research Center  1977 
 -  p.277:pic.:ill. 
<br/><br/><label>ISBN: </label>0889361150 
<br/><br/><label>Universal Decimal Class. No.: </label>633.4  / DOA