Purification of clay / 
Industrial research bureau, India (British) ; S. R. Das and M. A. Saboor. 
 - Delhi :  Manager of Publications,  1937. 
 - 7 p. ;  25 cm. 
 - Bulletins of Indian industrial research ;  no.9. .
<br/><br/><label>Dewey Class. No.: </label>607.2(54) In2b No.9