Purohit, S. K. <br/><br/>
Chemical and biological methods of water and air pollution control : a practical hygiene manual / 
Purohit, S. K. 
 - vi, 56 p. ; 19 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environment<br/>Water and air pollution control
<br/><br/><label>Dewey Class. No.: </label>628.5