363.7392<br/>PER<br/><br/>
2640<br/><br/>
Perkins, Henry C. <br/><br/>
Air pollution 
/ Henry C. Perkins 
. – New Delhi :  McGraw-Hill Kogakusha, 1974.
<br/><br/>407 p. 
<br/><br/>ISBN 0-07-049302-2 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>ENVIRONMENTAL STUDIES
<br/><br/><label>Dewey Class. No.: </label>363.7392  / PER