Columbia subject headings:
Harvard subject headings:
Literature--Philosophy--Congresses
Philosophy, Portuguese--20th century--Congresses.
Portuguese poetry--20th century--History and criticism--Congresses.
Theology in literature--Congresses.
Princeton subject headings:
Literature--Philosophy--Congresses.
Philosophy, Portuguese--20th century--Congresses.
Portuguese poetry--20th century--History and criticism--Congresses.
Theology in literature--Congresses.