EnVoc Multilingual Thesaurus of Environmental Terms. 

 - 4th ed. 
 - Nairobi :  United Nations Environment Programme,  [1997] 
 - xviii, 248 p. :  ill., maps ;  30 cm. 
<br/><br/> "May 1997."  "A product of INFOTERRA, UNEP's Global Environmental Information Exchange Network." 
<br/><br/><label>ISBN: </label>9280712608 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Subject headings--Environmental sciences.
<br/><br/><label>LC Class. No.: </label>Z695.1.E62  / E58 1997