Tolba, Mostafa Kamal. <br/><br/>
The state of the world environment, 1933 :  the 1983 report of the executive director of the United Nations Environment Programme Dr. Mostafa Kamal Tolba.  Folleto 

 - [S.l. :  UNEP,  1983] 
 - 18 p. ;  30 cm. 
<br/><br/> Catalogación preliminar. 
<br/><br/><br/>Texto en inglés.