P. S. Verma <br/><br/>
Environmantal Biology 

 - Kolkata  S. Chand  1998 
 - 550 p. 
<br/><br/><label>ISBN: </label>80 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany
<br/><br/><label>Dewey Class. No.: </label>574  / VER