Universal Decimal Classification :  auxiliary signs and subdivisions (except those of place) 

 - 2. ed 
 - 62 p. 
 - FID publication ; n.483 .
<br/><br/><label>ISBN: </label>0-580-08373-X 
<br/><br/><label>Universal Decimal Class. No.: </label>025.45CDU  / F293u