Ency. Britannica Co. <br/><br/>
Encyclopeadia Britannica 

 - 14th edn. 
 - Britanica  New Survey Of Univarsal Knowledge  1929 
 - xvi,1007p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>33:L68
<br/><br/><label>Dewey Class. No.: </label>33:L68  / F9.7