Columbia subject headings:
Harvard subject headings:
Church and state--Europe--History--19th century--Congresses.
Europe--Civilization--19th century--Congresses.
Kulturkampf--Europe--Congresses.
Religion and politics--Europe--History--19th century--Congresses.
Princeton subject headings:
Church and state--Europe--History--19th century--Congresses.
Europe--Civilization--19th century--Congresses.
Kulturkampf--Europe--Congresses.
Religion and politics--Europe--History--19th century--Congresses.