Purohit S S <br/><br/>
A Text Book of Environmental Sciences 
Purohit S S 
 - India  Mrs. Sarswati Purohit for Student Editio  2006 
 - P397 
<br/><br/><label>ISBN: </label>8188826146 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Sciences
<br/><br/><label>Dewey Class. No.: </label>628 P976A