Langley, Billy C.,  1931- <br/><br/>
Control systems for air conditioning and refrigeration / 
Billy C. Langley 
 - Englewood Cliffs, N.J.  Prentice-Hall  1985 
 - xv, 174 p.  ill.  25 cm. 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>0131716794  RM96.63 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air conditioning--Control<br/>Refrigeration and refrigerating machinery--Automatic control