Standard methods for testing tar and its products. 

 - 6th ed.;  edited by P. V. Watkins. 
 - Cleckheaton (Yorks.) :  Standardization of Tar Products Tests Committee,  1968. 
 - vii, 662 p., 5 fold. plates :  ill. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal-tar--Testing.<br/>Coal-tar products--Testing.