Columbia subject headings:
Theater--Germany--History--18th century--Congresses.
Theater--Germany--History--19th century--Congresses.
Harvard subject headings:
Theater--Germany--History--18th century--Congresses.
Theater--Germany--History--19th century--Congresses.
Princeton subject headings:
Theater--Germany--History--18th century--Congresses.
Theater--Germany--History--19th century--Congresses.