Verma,P.S. <br/><br/>
Environmental Biology  Principles of Ecology 
P.S.Verma. 
 - New Delhi:  S.Chand,  2018. 
 - viii,591p.;  22 cm. 
<br/><br/>Index 
<br/><br/><label>ISBN: </label>9788121908597 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany
<br/><br/><label>Dewey Class. No.: </label>580.3  / VER-E 2018 1012663