Columbia subject headings:
Ficker, Ludwig von, 1880-1967.
Rilke, Rainer Maria, 1875-1926.
Wittgenstein, Ludwig, 1889-1951.
Harvard subject headings:
Ficker, Ludwig von, 1880-1967
Rilke, Rainer Maria, 1875-1926
Wittgenstein, Ludwig, 1889-1951
Princeton subject headings:
Ficker, Ludwig von, 1880-1967.
Rilke, Rainer Maria, 1875-1926.
Wittgenstein, Ludwig, 1889-1951--Publishers.