Wignall, Norman <br/><br/>
The students’ text book of heating and ventilation / 
Norman Wignall ; revised by J. J. Barton. 
 - 12th ed. 
 - London:   Technitrade Journals,   1973.  
 - 195 p. :  ill. ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ventilation<br/>Heating
<br/><br/><label>Dewey Class. No.: </label>697