Columbia subject headings:
Harvard subject headings:
Church and state--Europe, Central--History--Congresses.
Church and state--Europe, Eastern--History--Congresses.
Former communist countries--Church history--21st century--Congresses.
Princeton subject headings:
Church and state--Europe, Central--History--Congresses.
Church and state--Europe, Eastern--History--Congresses.
Former communist countries--Church history--21st century--Congresses.