Verma, P S <br/><br/>
Concept of Ecology: Environmental Biology 

 - New Delhi  S Chand & Company  1999 
 - 264p. 
<br/><br/><label>Subjects--Uniform Titles: </label>--General Stack
<br/><br/><label>Subjects--Topical Terms: </label><br/>Life Sciences--BiologyBotany
<br/><br/><label>Dewey Class. No.: </label>577  / VER-C