Columbia subject headings:
Harvard subject headings:
Moore, G. E. (George Edward), 1873-1958.
Philosophy, Modern--20th century.
Wittgenstein, Ludwig, 1889-1951
Princeton subject headings:
Moore, G. E. (George Edward), 1873-1958.
Skepticism--History--20th century.
Wittgenstein, Ludwig, 1889-1951.