Methods of test for petroleum and its products.  Part 49,   penetration of bituminous materials / 
British Standards Institution. 
 - 5 pages ;  33cm. 
 - British standard ;  BS 2000 : PART 49 : 1983 .
 - British standard ;  BS 2000 : PART 49 : 1983 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petroleum products--Analysis.<br/>Bituminous materials--Great Britain.