Columbia subject headings:
Drama--20th century--Congresses.
Expressionism--Congresses.
German drama--20th century--Congresses.
Performing arts--Germany--Congresses.
Harvard subject headings:
Drama--20th century--Congresses.
Expressionism--Congresses.
German drama--20th century--Congresses.
Performing arts--Germany--Congresses.
Princeton subject headings:
Drama--20th century--Congresses.
Expressionism--Congresses.
German drama--20th century--Congresses.
Performing arts--Germany--Congresses.