Ambasht, R.S. <br/><br/>
Environment and pollution 
R.S. Ambasht and, P.K.; Ambasht. 
 - 3rd. ed.. 
 - Varanasi  Students Friends and Co.  1992 
 - 306p., 21cm. 
<br/><br/><label>Dewey Class. No.: </label>363.73  / A46E