Environmental air pollution and its control / 
editors, G. R. Chattwal...(et al.) 
 - Delhi :  Anmol Publications,  1989 
 - 591 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>8170412137 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air--Pollution