The New Encyclopaedia Britannica vol.21 / 

 - 15th ed. 
 - Chicago :  Encyclopaedia Britannica,  c1986. 
 -  col.ill.  ;  29 cm. 
<br/><br/> Spine title: Britannica.  Includes Propædia (1 v.) and Index (2 v.) 
<br/><br/>Includes bibliographies. 
<br/><br/>v. 1-12. Micropædia -- v. 13-29. Macropædia. 
<br/><br/><label>ISBN: </label>0852294344 (set) 
<br/><br/><label>LCCN: </label>85080367  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias and dictionaries.
<br/><br/><label>Dewey Class. No.: </label>032  / NEW