Columbia subject headings:
Philosophy, Modern--Congresses.
Schlick, Moritz, 1882-1936--Congresses.
Harvard subject headings:
Mathematics--Philosophy--Congresses
Physics--Congresses
Schlick, Moritz, 1882-1936--Congresses.
Science--Philosophy--Congresses
Princeton subject headings:
Philosophy, Modern--Congresses.
Schlick, Moritz, 1882-1936--Congresses.