Columbia subject headings:
Liberalism--France--History.
Liberalism--Germany--History.
Socialism--Europe--History.
Sociology--Europe--History.
Harvard subject headings:
Liberalism--France--History
Liberalism--Germany--History
Socialism--Europe
Socialism--Europe--History
Sociology--Europe--History
Princeton subject headings:
Liberalism--France--History.
Liberalism--Germany--History.
Socialism--Europe--History.
Sociology--Europe--History.