Langley, Billy C.,  1931- <br/><br/>
Electric controls for refrigeration and air conditioning / 
B. C. Langley 
 - Englewood Cliffs, N. J. :  Prentice-Hall,  1974 
 - 195 p. :  ill. ;  28 cm. 
<br/><br/><label>ISBN: </label>0132470721 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Refrigeration and refrigerating machinery--Automatic control<br/>Air conditioning--Control<br/>Heating--Control