Universal decimal classification 

 - 4th ed.  
 - London:   British Standards Institution,   1955 
 - 51p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library science
<br/><br/><label>Subjects--Index Terms: </label>Classification Nature 
<br/><br/><label>Universal Decimal Class. No.: </label>D 025.45  / M1