Ernest, James. <br/><br/>
Evaluation of polycross hybrids of sweet potato (Ipomoea batatas (L.) Lam.) in PNG / 
by James Ernest. 
 - Lae :  PNG University of Technology,  1992. 
 - vii, 62 p. :  col. ill. 
<br/><br/> A thesis submitted in partial fulfilment of the requirement for the Post-Graduate Diploma in Agriculture. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sweet potatoes--Research.<br/>Hybridization--Vegetables.