Purohit, S K <br/><br/>
Chemical and biological method of water and air pollution control: A practical hygiene manual 

 - Bikaner  Agro Botanical  1985 
 - vi, 56 p. 
<br/><br/><label>ISBN: </label> RS35 
<br/><br/><label>Dewey Class. No.: </label>628.166 P975C