Columbia subject headings:
Christian union--Europe--History.
Europe--Church history.
Lutheran Church--Relations--Reformed Church.
Reformed Church--Relations--Lutheran Church.
Harvard subject headings:
Christian union--Germany--History--20th century.
Leuenberger Konkordienentwurf.
Lutheran Church--Germany--History--20th century.
Lutheran Church--Relations--Reformed Church
Reformed Church--Germany--History--20th century.
Reformed Church--Relations--Lutheran Church
Princeton subject headings: