Air pollution / 
A K Tripathi. 
 - New Delhi :  Ashish,   1993 
 - 302 p. :  ill.   23 cm. 
<br/><br/><label>ISBN: </label>8170245214 ;9788170245216 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air -- Pollution.
<br/><br/><label>Universal Decimal Class. No.: </label>363.7392