Columbia subject headings:
Historians--Germany--Congresses.
Reformation--Study and teaching--Congresses.
Zeeden, Ernst Walter--Congresses.
Harvard subject headings:
Historians--Germany--Congresses.
Reformation--Study and teaching--Germany--Congresses.
Zeeden, Ernst Walter--Congresses.
Princeton subject headings:
Historians--Germany--Congresses.
Reformation--Study and teaching--Congresses.
Zeeden, Ernst Walter--Congresses.