Columbia subject headings:
Philosophy, German--Congresses.
Philosophy, Italian--Congresses.
Philosophy, Modern--Congresses.
Harvard subject headings:
Philosophy, German--History--Congresses.
Philosophy, Italian--History--Congresses.
Philosophy--Germany--History--Congresses.
Philosophy--Italy--History--Congresses.
Princeton subject headings:
Philosophy, German--Congresses.
Philosophy, Italian--Congresses.
Philosophy, Modern--Congresses.