The new encyclopedia Britannica in 30 volumes  micropaedia, v. VI, ready reference and index 

 - 15th ed. 
 - Chicago  Encyclopedia Britannica  1981 
 - 1026p. 
<br/><br/><label>ISBN: </label>0-85229-378-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reference Book
<br/><br/><label>Universal Decimal Class. No.: </label>03  / PRE