Columbia subject headings:
Other (Philosophy)--History--Congresses.
Philosophy, Ancient--Congresses.
Philosophy, Renaissance--Congresses.
Harvard subject headings:
Other (Philosophy)--History--Congresses.
Philosophy, Ancient--Congresses.
Philosophy, Renaissance--Congresses.
Princeton subject headings:
Other (Philosophy)--History--Congresses.
Philosophy, Ancient--Congresses.
Philosophy, Renaissance--Congresses.