Joshi, P.C.  <br/><br/>
A Textbook of Environmental Science 
P.C. Joshi  and Namita Joshi  
 - New Delhi  APH Publishing Corporation  2009 
 - 308 p. 
<br/><br/><label>ISBN: </label>9788131304563 
<br/><br/><label>Dewey Class. No.: </label>577.6  / JOS