Columbia subject headings:
Church and state--Europe--Congresses.
Europe--Religion--Congresses.
Secularism--Europe--Congresses.
Secularization (Theology)--Congresses.
Harvard subject headings:
Church and state--Europe--Congresses.
Europe--Religion--Congresses.
Secularism--Europe--Congresses.
Secularization (Theology)--Congresses.
Princeton subject headings: