Manual on traffic surveys. 

 - New York :  United Nations,  1971. 
 - [United Nations. Document] ;  E/CN.11/957 .
 - Document (United Nations) ;  E/CN.11/957 .
<br/><br/> "United Nations publication. Sales no.: E.71.II.F.13." 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>LCCN: </label>73170231 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Traffic surveys.
<br/><br/><label>LC Class. No.: </label>JX1977  / .A2 E/CN.11/957 
<br/><br/><label>Dewey Class. No.: </label>300/.8 s  388.3/14/0723