Columbia subject headings:
Idealism, German--Congresses.
Metaphysics--Congresses.
Philosophy, German--18th century--Congresses.
Philosophy, German--19th century--Congresses.
Harvard subject headings:
Metaphysics--Congresses
Philosophy, German--Congresses.
Princeton subject headings:
Idealism, German--Congresses.
Metaphysics--Congresses.
Philosophy, German--18th century--Congresses.
Philosophy, German--19th century--Congresses.