National fuel gas code handbook / 
edited by  Denise Beach 
 - 9th ed. 
 - Quincy, Mass. :  National Fire Protection Association,  2014 
 - xv, 555 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781455908691 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gas appliances--Standards<br/>Gas-fitting--Standards