Columbia subject headings:
Jaspers, Karl, 1883-1969--Congresses.
Philosophy, Modern--20th century--Congresses.
Harvard subject headings:
Jaspers, Karl, 1883-1969--Congresses.
Philosophy, Modern--20th century--Congresses.
Princeton subject headings:
Jaspers, Karl, 1883-1969--Congresses.
Philosophy, Modern--20th century--Congresses.