Indian standard safety requirements for floor and wall openings railings and toe boards 
Indian Standards Institution 
 - New Delhi  Indian Standards Institution  1969 
 - 10p. 
<br/><br/> IS 4912 : 1968 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Civil Engineering-Standards<br/> Standards <br/>NASA Thesaurus 
<br/><br/><label>Universal Decimal Class. No.: </label>083.7:69.028.8  / ISI