Supplements 

 - New York  United Nations U. S. A.       1975 
 - iii, 21p.  cm. 
 -  Supplement 20 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>History
<br/><br/><label>Dewey Class. No.: </label>V1N45,933:8.N75, L5,20