United States.  Library of Congress.  Subject Cataloging Division. [from old catalog] <br/><br/>
Classification :  Class A : General works, polygraphy. 

 - 3d ed. 
 - Washington :  Govt. Print. Off.,  1947. 
 - iv, 47 p.  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Classification--Books--General works.<br/>Classification, Library of Congress.