Columbia subject headings:
Catholic Church--Germany--History.
Catholic Church. Diocese of Halberstadt (Germany)--History.
Catholic Church. Diocese of Liège (Belgium)--History.
Holy Roman Empire--History--Saxon House, 919-1024.
Monasteries--Germany--History.
Monasteries--Germany--Seals--History.
Harvard subject headings:
Bulls, Papal--History.
Bulls, Papal.
Catholic Church. Diocese of Halberstadt (Germany)--History.
Catholic Church. Diocese of Liège (Belgium)--History.
Church history--Middle Ages, 600-1500--Sources.
Diplomatics, Latin--Holy Roman Empire.
Germany--Church history--843-1517.
Holy Roman Empire--History--Saxon House, 919-1024.
Monasteries--Germany--History.
Monasteries--Germany--Seals--History.
Monastic and religious life--Germany--Papal documents--History.
Monasticism and religious orders--Germany--Papal documents--History.
Papal documents--History.
Princeton subject headings:
Catholic Church--Germany--History.
Catholic Church. Diocese of Halberstadt (Germany)--History.
Catholic Church. Diocese of Liège (Belgium)--History.
Holy Roman Empire--History--Saxon House, 919-1024.
Monasteries--Germany--History.
Monasteries--Germany--Seals--History.