Manual on traffic surveys 

 - New  York United Nations U. S. A.    1971 
 - "vi, 128p."  cm. 
<br/><br/> Sales No. E.71.11.F.13 
<br/><br/><label>Standard No.: </label>64506 
<br/><br/><label>Source: </label> Reports 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Road Transport Economics
<br/><br/><label>Dewey Class. No.: </label>"X411.1.N7t4, L1"