Heydon, D. L. <br/><br/>
Annual report of the senior economist training planning, Economics and Marketing Branch / 
D.L. Heydon. 
 - Port Moresby :  Dept. of Primary Industry,  1980. 
 - [various pagings] ;  29 cm. 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Papua New Guinea--Economic conditions.