The environmental challenge. 

 - Washington DC, :  World bank,   1991 
 - 29 p. ;  23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>United Nations Environment Programme. <br/>United Nations -- Environmental policy.
<br/><br/><label>Dewey Class. No.: </label>333.7  / WOE 1991