Columbia subject headings:
European Union countries--Politics and government.
Liberalism--European Union countries--History.
Political parties--Law and legislation--European Union countries--History.
Harvard subject headings:
European Union countries--Politics and government--20th century.
European Union countries--Politics and government--21st century.
Liberalism--European Union countries--History--20th century.
Liberalism--European Union countries--History--21st century.
Political parties--European Union countries--History--20th century.
Political parties--European Union countries--History--21st century.
Princeton subject headings:
European Union countries--Politics and government--20th century.
European Union countries--Politics and government--21st century.
Liberalism--European Union countries--History--20th century.
Liberalism--European Union countries--History--21st century.
Political parties--European Union countries--History--20th century.
Political parties--European Union countries--History--21st century.