Columbia subject headings:
Popular culture--Canada--History--20th century.
Popular culture--Great Britain--History--20th century.
Theater and society--Canada.
Theater and society--Great Britain.
Theater--Canada--History--20th century.
Theater--Great Britain--History--20th century.
Theater--Political aspects.
Harvard subject headings:
Popular culture--Canada--History--20th century.
Popular culture--Great Britain--History--20th century
Theater and society--Canada--History--20th century.
Theater and society--Canada.
Theater and society--Great Britain--History--20th century.
Theater and society--Great Britain.
Theater--Canada--History--20th century.
Theater--Great Britain--History--20th century
Theater--Political aspects.
Princeton subject headings:
Popular culture--Canada--History--20th century.
Popular culture--Great Britain--History--20th century.
Theater and society--Canada.
Theater and society--Great Britain.
Theater--Canada--History--20th century.
Theater--Great Britain--History--20th century.
Theater--Political aspects.