Khan, Gilbert. <br/><br/>
Progressive filing / 
Gilbert Kahn and Theodore Yerian. 
 - London :   Gregg,  c 1955. 
 - vi, 151 p. :  ill. ;  24 cm.  
<br/><br/> Includes index. 
<br/><br/>337  337 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Filing systems.
<br/><br/><label>Dewey Class. No.: </label>029 / K12p