Columbia subject headings:
Harvard subject headings:
Architecture and society--Germany--Congresses.
Architecture, Medieval--Germany--Staufen im Breisgau--Congresses.
Germany--History--Hohenstaufen, 1138-1254--Congresses.
Social classes--Germany--History--Congresses.
Social history--Congresses
Staufen im Breisgau (Germany)--Buildings, structures, etc.--Congresses.
Princeton subject headings:
Architecture, Medieval--Germany--Staufen im Breisgau--Congresses.
Architecture--Germany--Staufen im Breisgau--History--Congresses.
Staufen im Breisgau (Germany)--Buildings, structures, etc.--Congresses.