Key environmental indicators. 

 -   Paris  :   OECD Environmental directorate,   1991- 
 - v. ;   30 cm. 
 - Triennial 
 - 1991- 
<br/><br/>  Latest issue consulted: 2004 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Environmental indicators.<br/> Conservation of natural resources.
<br/><br/><label>Dewey Class. No.: </label>363.7