International petroleum encyclopedia 1992 / 

 - 25th issue 
 - Tulsa:  PennWell Publishing Co.,  1992. 
 - 358p;29cm 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0878143769 
<br/><br/><label>Dewey Class. No.: </label>665.5 INT