Columbia subject headings:
Christian union--Catholic Church.
Christian union--Germany.
Metzger, Max Josef, 1887-1944.
Una Sancta Movement.
Harvard subject headings:
Christian union--Catholic Church
Christian union--Germany.
Metzger, Max Josef, 1874-1944.
Metzger, Max Josef, 1887-1944.
Sancta Movement.
Una Sancta Movement.
Princeton subject headings:
Christian union--Catholic Church.
Christian union--Germany.
Metzger, Max josef, 1874-1944.
Una Sancta Movement.