title: Celebrating the 150th anniversary of the National Academy of Sciences.
authors: Ralph J
authors: RJ
authors: Cicerone
mesh_terms: D000846:Anniversaries and Special Events; D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D009307:National Academy of Sciences, U.S. / Q000266:history*; D011173:Portraits as Topic; D014481:United States