The World Book Encyclopedia, Vol.9 : H 

 - Chicago  World Book Inc  1984 
 - 428 p. 
<br/><br/> Illustrations, Maps; Photos 
<br/><br/><label>ISBN: </label>716600846 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopaedia<br/>General
<br/><br/><label>Dewey Class. No.: </label>R032  / W.B.E.