Gentral EnvironmentalAuthority <br/><br/>
Man And Environment 

 - Colombo  Lakma Printers & Publisher (P  vt)Ltd.    1995 
 - 189, P. 
<br/><br/><label>ISBN: </label>9559012088 
<br/><br/><label>Dewey Class. No.: </label>333.714