Bureau of Indian Standard <br/><br/>
IS : 2720 Pt XXI 1977 

 - 1st 
 - New Delhi  Bureau of Indian Standard  2005 
 - 8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Civil Engineering
<br/><br/><label>Dewey Class. No.: </label>624  / BU-I