Specification for 35 mm microcopying of technical drawings.  Part 1.  Operating procedures / 
British Standards Institution. 
 - 7 leaves :  illustrations ;  33 cm. 
 - British standard ;  BS 4210 : Part 1 : 1977 .
 - British standard ;  BS 4210 : Part 1 : 1977 .
<br/><br/><label>ISBN: </label>058009748X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microphotography--Standards.