Columbia subject headings:
Cities and towns--Europe, German-speaking--History--Congresses.
Theater--Europe, German-speaking--History--Congresses.
Harvard subject headings:
Cities and towns--Europe, German-speaking--History--Congresses.
Theater--Europe, German-speaking--History--Congresses.
Princeton subject headings:
Cities and towns--Europe, German-speaking--History--Congresses.
Theater--Europe, German-speaking--History--Congresses.