The world book encyclopedia  : N-O 

 - London  World book international  1997 
 - 542p.ill.  V.14 
<br/><br/><label>ISBN: </label>0716666979 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopaedia<br/>Encyclopaedia-Factbook
<br/><br/><label>Dewey Class. No.: </label>031.2  / ENC