Universal decimal classification 

 -  1943 
<br/><br/><label>Standard No.: </label>348,491 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>LIBRARY SCIENCE
<br/><br/><label>Dewey Class. No.: </label>2:51M9, qH3;55;17