Langley, Billy C.,  1931- <br/><br/>
Estimating air conditioning systems / 
Billy C. Langley. 
 - Reston, Va. :  Reston Pub. Co.,  1983. 
 - 261 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical reference and index. 
<br/><br/><label>ISBN: </label>0835917908 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air conditioning--Estimates.