Indian standard specification for timber door, window and ventilator frames 
Indian Standards Institution 
 - New Delhi  Indian Standards Institution  1973 
 - 16p. 
<br/><br/> IS 4021 : 1967 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Standards <br/> Timber Doors <br/> Ventilator Frames<br/>NASA Thesaurus 
<br/><br/><label>Universal Decimal Class. No.: </label>083.7:69.028.1  / ISI