Microfilm, readers and reels. 

 - 1st ed. 
 - London :    British Standards Institution,    1956. 
 - 15 p. :    ill. ;    21 cm. 
<br/><br/>  British Standard 1371 : 1956 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Microfilms.<br/> Microfilm readers.<br/> Reels (music).