Langley, Billy C.,  1931- <br/><br/>
Heat pump technology / 
Billy C. Langley 
 - Reston, Va. :  Reston Pub. Co;  1983 
 - 373 p. :  ill. ;  25 cm. 
<br/><br/>Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heat pumps