World copyright:  An encyclopedia 

 - Leyden:  A. W. Sijthoff,   1954 
<br/><br/> Vol.2 (C1-I) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia
<br/><br/><label>Universal Decimal Class. No.: </label>D 347.78  / J3.2