Statistical abstract 

 - Praque  Orbis            1963 
 -  1963 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social Science
<br/><br/><label>Dewey Class. No.: </label>Sigma.5925s, K3/GD