King, G. A. <br/><br/>
A systems approach to improving subsistence yam production in Central Province / 
by G.A. King. 
 - London :  Elsevier Science Publishers,  c1989. 
 - [12] p. ;  30 cm. 
<br/><br/><br/>An article from: Agricultural Systems 31 (1989) pp 157-168. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Yams--Papua New Guinea--Central Province.