Columbia subject headings:
Harvard subject headings:
European literature--19th century--History and criticism--Congresses.
Princeton subject headings:
European literature--19th century--History and criticism--Congresses.
European literature--20th century--History and criticism--Congresses.
Literature, Modern--19th century--History and criticism--Congresses.
Literature, Modern--20th century--History and criticism--Congresses.
Science in literature--Congresses.