Columbia subject headings:
Political leadership--United States--History--20th century.
Presidents--United States--History--20th century.
United States--Politics and government--20th century.
Harvard subject headings:
Political leadership--United States--History--20th century
Presidents--United States--History--20th century
United States--Politics and government--20th century.
Princeton subject headings:
Political leadership--United States--History--20th century.
Presidents--United States--History--20th century.
United States--Politics and government--20th century.