Columbia subject headings:
Drama--19th century--History and criticism.
Drama--20th century--History and criticism.
Realism in literature.
Harvard subject headings:
Drama--19th century--History and criticism
Drama--20th century--History and criticism
Realism in literature.
Princeton subject headings:
Drama--19th century--History and criticism.
Drama--20th century--History and criticism.
Realism in literature.