A bridgments of Specifications 30,001-35,000 / 
Patent Office, India. 
 - Delhi :  Manager of Publications,  1955 
 - 88 p. :  ills. ;  25 cm. 
<br/><br/> Group XXv. cements. Bricks and stone working 1. Bricls. Blocks, slabs, tiles and pottery.2. cement concrete, Plaster Artiticas stone Asphaland Refratory mam facture 3. stone cutting and woalling. 
<br/><br/><label>Dewey Class. No.: </label>608.754