Manual on traffic surveys. 

 - New York :    United Nations,    1971. 
 - vi, 129 p. :    ill. ;    29 cm. 
<br/><br/>  "United Nations publication. Sales no.: E.71.II.F.13." 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Traffic surveys.