Universal decimal classification (UDC) 

 - Washington  The National Science Foundation       1970 
 - 324p.  cm. 
<br/><br/><label>Standard No.: </label>33971 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>LIBRARY SCIENCE
<br/><br/><label>Dewey Class. No.: </label>2:51M96, qL0