Guide to the card service and cis classification 

 - Rev. ed. 
 - Geneva:   International Occupational Safety and Health Information Centre,   1961 
 - 83p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Classification
<br/><br/><label>Subjects--Index Terms: </label>CIS 
<br/><br/><label>Universal Decimal Class. No.: </label>D 025.49CIS  / K1