Sapru, Rk <br/><br/>
New Environmental Age 

 - New Delhi  Ashish Publishing House  1990 
 - 418 
<br/><br/> includes index and biblioraphy 
<br/><br/><label>ISBN: </label> 0 
<br/><br/><label>Dewey Class. No.: </label>Q60  / SA690