Columbia subject headings:
Breviaries--History.
Catholic Church--Germany--Passau--Liturgy--History.
Passau (Germany)--Religious life and customs.
Theology, Doctrinal--History--Middle Ages, 600-1500.
Harvard subject headings:
Catholic Church--Liturgy--History--Middle Ages, 600-1500.
Catholic Church. Breviary (Passau)
Catholic Church. Diocese of Passau (Germany)
Passau (Germany)--Church history.
Princeton subject headings: