Columbia subject headings:
Christian union--Germany--Congresses.
Lutheran Church--Germany--History--19th century--Congresses.
Lutheran Church--Germany--History--20th century--Congresses.
Reformed Church--Germany--History--19th century--Congresses.
Reformed Church--Germany--History--20th century--Congresses.
Harvard subject headings:
Lutheran Church--Germany--History--Congresses.
Reformed Church--Germany--History--Congresses.
Princeton subject headings: