Specification for 35mm and 16mm microfilms spools and reels / 
British Standards Institution. 
 - 9 pages :  illustrations ;  30cm. 
 - British standard ;  BS 1371 : 1973 .
 - British standard ;  BS 1371 : 1973 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microfilms--Standards.<br/>Microphotography.