Columbia subject headings:
American drama--20th century--History and criticism.
Off Off-Broadway theater--History--20th century.
Harvard subject headings:
American drama--20th century--History and criticism
Off Off-Broadway theater--History--20th century.
Off Off-Broadway theater--History.
Theater--New York (State)--New York--History.
Princeton subject headings:
American drama--20th century--History and criticism.
Off Off-Broadway theater--History--20th century.