Science in the 20th century 
Scientific American  
 - New York  Scientific American  1991 
 - 184p.  col. plates;diags;illus;refs 
<br/><br/> Special issue of the Scientific American Magazine 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ScienceScience History 20th Century
<br/><br/><label>Universal Decimal Class. No.: </label>5"20"  / SA