Columbia subject headings:
Harvard subject headings:
Cities and towns--Germany--History--Congresses.
Emblems--Germany--History--Congresses.
Imperial cities (Holy Roman Empire)--History--Congresses.
Imperialism in art--History--Congresses.
Signs and symbols--Germany--History--Congresses.
Symbolism in art--Germany--History--Congresses.
Symbolism--Germany--History--Congresses.
Princeton subject headings:
Cities and towns--Germany--History--Congresses.
Emblems--Germany--History--Congresses.
Imperial cities (Holy Roman Empire)--History--Congresses.
Imperialism in art--History--Congresses.
Signs and symbols--Germany--History--Congresses.
Symbolism in art--Germany--History--Congresses.
Symbolism--Germany--History--Congresses.