Columbia subject headings:
Harvard subject headings:
American literature--20th century--History and criticism--Congresses
Canadian literature--20th century--History and criticism--Congresses.
Comparative literature--Congresses.
European literature--20th century--History and criticism--Congresses.
Princeton subject headings:
American literature--20th century--History and criticism--Congresses.
Canadian literature--20th century--History and criticism--Congresses.
European literature--20th century--History and criticism--Congresses.