The New Encyclopedia Britannica 

 - 15th 
 - Encyclopedia Britannica, Inc.  Chicago  1980 
 - 1132p.  ILL.,Cht.,Fig and Table 
 - Volume  4 .
<br/><br/><label>ISBN: </label>0-85229-360-7 
<br/><br/><label>Nat. Bib. No.: </label>4841 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias & Books of Facts
<br/><br/><label>Universal Decimal Class. No.: </label>30  / THE