Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Church history--Congresses.
Europe, German-speaking--Church history--Congresses.
Germany--Church history--Congresses.
Protestant churches--Balkan Peninsula--History--Congresses.
Protestant churches--Europe, German-speaking--History--Congresses.
Protestant churches--Germany--History--Congresses.
Protestantism--Balkan Peninsula--History--Congresses.
Protestantism--Europe, German-speaking--History--Congresses.
Protestantism--Germany--History--Congresses.
Princeton subject headings:
Protestantism--Balkan Peninsula.
Protestantism--Europe, Central.
Protestantism--Germany.