"Vyas, Harishchandra" <br/><br/>
Paryavaran shiksha 

 - New Delhi  Vidhya Vihar Prakashan  1992 
 - 288p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environments
<br/><br/><label>Dewey Class. No.: </label>H 333.707