Specification for microfilm jackets, A6 size / 
British Standards Institution. 
 - 3 pages :  illustrations ;  30cm. 
 - British standard ;  BS 5632 : 1978 .
 - British standard ;  BS 5632 : 1978 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Standards, Engineering --Great Britain.