Road research 

 - His Majesty's Stationery Office  1949  London 
 - 8p.  ill. 
 - Road note no.6 .
<br/><br/><label>Nat. Bib. No.: </label>2112 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering
<br/><br/><label>Universal Decimal Class. No.: </label>625.74  / DAM