Columbia subject headings:
Cologne (Germany)--Historiography.
Diplomatics--Germany--Cologne.
Germany--History--1273-1517--Historiography.
Heraldry--Germany--Cologne.
Harvard subject headings:
Church history--Middle Ages, 600-1500
Civilization, Medieval.
Germany--History--To 1517.
Middle Ages.
Princeton subject headings:
Cologne (Germany)--Historiography.
Diplomatics--Germany--Cologne.
Germany--History--1273-1517--Historiography.
Heraldry--Germany--Cologne.