World directory of environment organization  

 - 6th ed.  
 - London:   Earthscan Publication Limited,   2001 
 - 263p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environment 
<br/><br/><label>Subjects--Index Terms: </label>Directory  
<br/><br/><label>Universal Decimal Class. No.: </label>R 504:061.62(058)  / P1