20th Waigani Seminar 1993 Programme :  from Rio to Rai, Environment and development ; 22-27 August 1993 University of papua New Guinea. 

 - Waigani :  University of Papua New Guinea,  1993. 
 - 27 p. 
<br/><br/> 20th Waigani Seminar Programme from 22-27 August 1993.