Columbia subject headings:
Church and state--Europe, Central--History--Congresses.
Europe, Central--Church history--Congresses.
Secularization--Europe, Central--History--Congresses.
Harvard subject headings:
Church and state--Europe, Central--History--Congresses.
Europe, Central--Church history--Congresses.
Secularization--Europe, Central--History--Congresses.
Princeton subject headings:
Church and state--Europe, Central.
Secularization--Europe, Central.