Columbia subject headings:
Classical literature--History and criticism--Congresses.
Philosophical literature--History and criticism--Congresses.
Philosophy, Ancient--Congresses.
Harvard subject headings:
Classical literature--History and criticism--Congresses
Philosophical literature--History and criticism--Congresses.
Philosophy, Ancient--Congresses.
Princeton subject headings:
Classical literature--History and criticism--Congresses.
Philosophical literature--History and criticism--Congresses.
Philosophy, Ancient--Congresses.