The New Encyclopedia Britannica. Macropedia. Knowledge in Depth. Vol. 20. Geomorphic - Immunity 

 - Chicago:  Pub.United States  0 
 - 789 pages 
 - 15 th. ed. .
<br/><br/><label>ISBN: </label>101593392923 
<br/><br/><label>Subjects--Index Terms: </label>The New Encyclopedia Britannica. Macropedia. Knowledge in Depth. Vol. 20. Geomorphic - Immunity. 
<br/><br/><label>Dewey Class. No.: </label>30  / N532