Classification 
Library of Congress. 
 - Washington  Library of Congress  1936 
 - x, 246p.; 24cm. 
<br/><br/> Contents:- Class P. P J. P M. with supplement. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Classification Classification.
<br/><br/><label>Dewey Class. No.: </label>25.43  / U04C