Columbia subject headings:
Christianity--Europe--History--Congresses.
Church and state--Europe--History--Congresses.
Nationalism--Europe--History--Congresses.
Nationalism--Religious aspects--Christianity--Congresses.
Harvard subject headings:
Church and state--Europe--History--Congresses.
Church history--Congresses.
Nationalism--Europe--History--Congresses.
Nationalism--Religious aspects--Christianity--Congresses.
Princeton subject headings: