1993 Science Year:  The World Book Annual Science Supplement/ 
World Book , Inc. 
 - Chicago, London:  Scott Fetzer Company,  c1992. 
 - 385p.;  ill,  22cm. 
<br/><br/> Includes index and bibliographical references. 
<br/><br/><label>ISBN: </label>0716611937 
<br/><br/><label>LC Class. No.: </label>REF Q 9  / .S33 1992