Langley,Billy C. <br/><br/>
Electromechanical and electronic controls for HVACIR / 
Langley,Billy C. 
 - New Jersey:  PH,  1999. 
 - vii,433p;25cm 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0139075690 
<br/><br/><label>Dewey Class. No.: </label>621.56 LAN