Columbia subject headings:
Harvard subject headings:
Logic--Congresses
Mathematics--Philosophy--Congresses
Philosophy--Congresses
Science--Philosophy--Congresses
Wittgenstein, Ludwig, 1889-1951--Congresses.
Princeton subject headings:
Logic--Congresses.
Mathematics--Philosophy--Congresses.
Philosophy--Congresses.
Science--Philosophy--Congresses.
Wittgenstein, Ludwig, 1889-1951--Congresses.