Columbia subject headings:
Catholic Church--Relations--Protestant churches.
Evangelischer Bund--History.
Protestant churches--Europe, German-speaking--History.
Protestant churches--Germany--History.
Protestant churches--Relations--Catholic Church.
Harvard subject headings:
Christian union--Germany.
Ecumenical movement--Germany--History.
Evangelischer Bund.
Germany--Church history.
Protestant churches--Germany--History.
Theology.
Princeton subject headings:
Catholic Church--Relations--Protestant churches.
Evangelischer Bund--History.
Protestant churches--Europe, German-speaking--History.
Protestant churches--Germany--History.
Protestant churches--Relations--Catholic Church.