Road research 

 - Second 
 - His Majesty's Stationery Office  1950  London 
 - 15p.  fig., table 
 - road note no.4 .
<br/><br/><label>Nat. Bib. No.: </label>205 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering
<br/><br/><label>Universal Decimal Class. No.: </label>625.74  / DES