1991 britannica book of the year 
/ Encyclopaedia Britannica, Inc.,  
 - Chicago:   Encyclopaedia Britannica, Inc.,   1991 
 - 910p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reference works
<br/><br/><label>Universal Decimal Class. No.: </label>R 030.1   / N1