Columbia subject headings:
Harvard subject headings:
Bishops--Germany--Cologne--Tombs.
Bishops--Germany--Mainz (Landkreis)--Tombs.
Bishops--Germany--Trier--Tombs.
Sepulchral monuments--Germany--Cologne.
Sepulchral monuments--Germany--Mainz (Landkreis)
Sepulchral monuments--Germany--Trier.
Princeton subject headings:
Bishops--Tombs--Germany--Cologne.
Bishops--Tombs--Germany--Mainz (Rhineland-Palatinate).
Bishops--Tombs--Germany--Trier.
Sepulchral monuments--Germany--Cologne.
Sepulchral monuments--Germany--Mainz (Rhineland-Palatinate).
Sepulchral monuments--Germany--Trier.