Columbia subject headings:
Bloch, Ernst, 1885-1977--Congresses.
Humanism--Congresses.
Harvard subject headings:
Bloch, Ernst, 1885-1977--Congresses.
Humanism--Congresses.
Metaphysics--Congresses
Princeton subject headings:
Bloch, Ernst, 1885-1977--Congresses.
Humanism--Congresses.