Leffler, William L. <br/><br/>
Petroleum refining in nontechnical language / 
William L. Leffler 
 - 4th ed. 
 - Tulsa, Okla. :  Pennwell,  c2008 
 - xvi, 259 p. :  ill. ;  24 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>1593701586 9781593701581 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petroleum chemicals