Proceedings and documentation of the symposium organized by the United Nations Economic Commission for Europe and held from 2 to 15 May 1971 in Prague (Czechoslovakia) :  with a study tour to the region of Ostrava (Czechoslovakia) and Katowice (Poland). 

 - New York :  United Nations,  1971. 
 - [United Nations. Document] ;  ST/ECE/ENV/1 .
 - Document (United Nations) ;  ST/ECE/ENV/1 .
<br/><br/> "United Nations publication. Sales number: E.71.II.E.6." 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>LCCN: </label>72191103 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental engineering -- Congresses.--Environmental engineering -- Congresses.<br/>Environmental policy -- Congresses.--Environmental policy -- Congresses.
<br/><br/><label>LC Class. No.: </label>TD5  / .E2 1971 
<br/><br/><label>Dewey Class. No.: </label>333.7/2/094