Bera, Dr. Ajit Kr. <br/><br/>
Environmental  Concept 

 - 1st /   2001. 
 - Calcutta:  New  Central  Book  Agency (P)  Ltd.,  2001. 
 - 179p. 
<br/><br/><label>Subjects--Personal Names: </label><br/> .Environmental Sci., Environmental Concepts. 
<br/><br/><label>Dewey Class. No.: </label>333.707