Columbia subject headings:
Harvard subject headings:
Democracy--Europe--History--19th century.
Democracy--Europe--History--20th century.
National socialism--Europe.
Socialism--Europe--History--19th century.
Socialism--Europe--History--20th century
Princeton subject headings:
Democracy--Europe--History--19th century.
Democracy--Europe--History--20th century.
National socialism--Europe.
Socialism--Europe--History--19th century.
Socialism--Europe--History--20th century.