Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Church history--20th century--Congresses.
Church and state--History--Congresses.
Europe, Eastern--Church history--20th century--Congresses.
Former communist countries--History--Congresses.
Religion and politics--Europe, Central--History--Congresses.
Religion and politics--Europe, Eastern--History--Congresses.
Religion and politics--Europe, Southern--History--Congresses.
Religion and state--Europe, Central--History--Congresses.
Religion and state--Europe, Eastern--History--Congresses.
Religion and state--Europe, Southern--History--Congresses.
Princeton subject headings:
Balkan Peninsula--Religion--Congresses.
Church and state--Balkan Peninsula--Congresses.
Church and state--Europe, Central--Congresses.
Church and state--Europe, Eastern--Congresses.
Europe, Central--Religion--Congresses.
Europe, Eastern--Religion--Congresses.