Columbia subject headings:
Harvard subject headings:
Duchies--Germany--History--Congresses.
Germany--Kings and rulers--Congresses.
Princes--Germany--History--16th century--Congresses.
Princes--Germany--History--To 1500--Congresses.
Princes--Germany--Public opinion--Congresses.
Princeton subject headings:
Duchies--Germany--History--Congresses.
Germany--Kings and rulers--Congresses.
Princes--Germany--History--16th century--Congresses.
Princes--Germany--History--To 1500--Congresses.
Princes--Germany--Public opinion--Congresses.