Bureau of Indian Standard <br/><br/>
IS : 1726 1991  Cast iron manhole covers and frames specification 

 - 1st 
 - New Delhi  Bureau of Indian Standard  1991 
 - 10 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Architecture
<br/><br/><label>Dewey Class. No.: </label>720  / BU-I