Columbia subject headings:
Harvard subject headings:
Mexican drama--History and criticism.
Portuguese drama--History and criticism.
Spanish drama--History and criticism.
Theater--Mexico--History--20th century.
Theater--Portugal--History--20th century.
Theater--Spain--History--20th century.
Princeton subject headings:
Mexican drama--20th century--History and criticism.
Portuguese drama--20th century--History and criticism.
Spanish drama--20th century--History and criticism.
Theater--Mexico--History--20th century.
Theater--Portugal--History--20th century.
Theater--Spain--History--20th century.