The work of the Economic Commission for Europe, 1947-1972. 

 - New York :  United Nations,  1972. 
 - United Nations. [Document] ;  E/ECE/831 .
 - Document (United Nations) ;  E/ECE/831 .
<br/><br/> "United Nations publication. Sales number: E.72.II.E.3." 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>LCCN: </label>74172910