Columbia subject headings:
Breisgau (Germany)--Congresses.
Castles--Germany--Breisgau--Congresses.
Harvard subject headings:
Architecture, Medieval--Germany--Breisgau--History--To 1500--Congresses.
Breisgau (Germany)--Congresses.
Castles--Germany--Breisgau--History--To 1500--Congresses.
Castles--Germany--Congresses.
Castles--Rhine River Region--History--To 1500--Congresses.
Excavations (Archaeology)--Germany--Breisgau--Congresses.
Excavations (Archaeology)--Rhine River Region--Congresses.
Princeton subject headings:
Architecture, Medieval--Germany--Breisgau--History--To 1500--Congresses.
Castles--Germany--Breisgau--History--To 1500--Congresses.
Castles--Rhine River Region--History--To 1500--Congresses.
Excavations (Archaeology)--Germany--Breisgau--Congresses.
Excavations (Archaeology)--Rhine River Region--Congresses.