Universal decimal classification. International 

 - 4th 
 - London  British Standard house       1962 
 - 12p.  cm. 
<br/><br/> Contents UDC 654: Telecommunication services organization, administration and operation 
<br/><br/><label>Standard No.: </label>6,425 
<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, qK91-;13