Asthana, D.K. . <br/><br/>
A Textbook of Environmental Studies /  Textual Documents 
D.K. Asthana. 
 - 1st ed / 
 - Delhi :  S. Chand & Co. ,  2006. 
 - 460p ;  23 cm. 
<br/><br/><label>Subjects--Index Terms: </label>Biology G-Biology Dept-Botany 
<br/><br/><label>Dewey Class. No.: </label>574.522