Columbia subject headings:
Bishops--Germany--Passau--History--Sources.
Catholic Church. Diocese of Passau (Germany)--History--Sources.
Harvard subject headings:
Bishops--Germany--Passau--History--Sources.
Catholic Church. Diocese of Passau (Germany)--History--Sources.
Princeton subject headings:
Catholic Church. Diocese of Passau (Germany)--History--Sources.
Church history--Middle Ages, 600-1500.
Passau (Germany)--Church history.