Heating ventilating air conditioning guide, Vol.21 

 - 21 
 -  American Society of Heating and Ventilating Engineers, New York  1943 
 - 1160+90 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heating, ventilating, air conditioning
<br/><br/><label>Dewey Class. No.: </label>R 697  HEA21.21