Columbia subject headings:
Harvard subject headings:
Europe--History--1871-1918.
Europe--History--20th century.
Europe--Politics and government--1871-1918.
Europe--Politics and government--20th century.
Ideology.
Political science--Europe--History--19th century.
Political science--Europe--History--20th century.
Princeton subject headings:
Europe--History--1871-1918.
Europe--History--20th century.
Europe--Politics and government--1871-1918.
Europe--Politics and government--20th century.
Ideology.
Political science--Europe--History--19th century.
Political science--Europe--History--20th century.