Isangkura, A. <br/><br/>
Environmental valuation: an entrance fee system for national parks in Thailand 
Adis Isangkura 
 - Singapore  EEPSEA  1998 
 - 30 p.30cm 
 - EEPSEA research report series .
<br/><br/> COMP 
<br/><br/><label>Dewey Class. No.: </label>333.7  / ISA