Columbia subject headings:
Philosophers--Austria--Biography.
Philosophers--Great Britain--Biography.
Wittgenstein, Ludwig, 1889-1951.
Harvard subject headings:
Philosophers--Austria--Biography
Philosophers--England--Biography
Philosophers--Germany--Biography
Philosophers--Great Britain--Biography
Wittgenstein, Ludwig, 1889-1951
Princeton subject headings:
Philosophers--Austria--Biography.
Philosophers--Great Britain--Biography.
Wittgenstein, Ludwig, 1889-1951.