Science Year :  the world book annual science supplement/ 
World book. 
 - Chicago :  World book,  1991. 
 - 400 p. :  ill. ; 
<br/><br/> Includes index  
<br/><br/><label>ISBN: </label>716605910 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science stories
<br/><br/><label>LC Class. No.: </label>REF Q9 .W67 1991