1991 Yearbook of science and the future 
/ Encyclopaedia Britannica, Inc. 
 - Chicago:   Encyclopaedia Britannica, Inc.,   1990 
 - 510p. 
<br/><br/><label>ISBN: </label>0852295251 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Universal Decimal Class. No.: </label>R 5/6(058)  / N1