Bethea, Robert M. <br/><br/>
Air control technology :  an engineering analysis points of view / 
Robert M. Bethea 
 - New York :  Van Nostrand Reinhold,  1978 
 - xv, 449 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0442207158 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air--Pollution<br/>Air--Purification--Equipment and supplies<br/>Environmental engineering