Columbia subject headings:
American drama--20th century--History and criticism--Congresses.
English drama--20th century--History and criticism--Congresses.
Postmodernism (Literature)--English-speaking countries--Congresses.
Harvard subject headings:
American drama--20th century--History and criticism--Congresses.
English drama--20th century--History and criticism--Congresses.
English drama--Political aspects--Congresses.
Postmodernism (Literature)--Congresses.
Postmodernism (Literature)--English-speaking countries--Congresses.
Theater--History--20th century--Congresses.
Princeton subject headings:
American drama--20th century--History and criticism--Congresses.
English drama--20th century--History and criticism--Congresses.
Postmodernism (Literature)--English-speaking countries--Congresses.