Columbia subject headings:
Theater--Germany--Berlin--History--19th century--Sources.
Theater--Germany--Berlin--History--20th century--Sources.
Harvard subject headings:
Theater--Germany--Berlin--History--19th century--Sources.
Theater--Germany--Berlin--History--20th century--Sources.
Princeton subject headings:
Theater--Germany--Berlin--History--19th century--Sources.
Theater--Germany--Berlin--History--20th century--Sources.