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 

 - New York  United Nations  1971 
 - vii, 386 p. : ill. ; 29 cm. 
<br/><br/> 'United Nations publication. Sales number: E.71.II.E.6.' 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental engineering--Congresses<br/>Environmental policy--Congresses