Columbia subject headings:
Hänsel, Ludwig, 1886-1959--Diaries.
Teachers--Austria--Diaries.
Wittgenstein, Ludwig, 1889-1951--Friends and associates--Diaries.
Wittgenstein, Ludwig, 1889-1951.
Harvard subject headings:
Hänsel, Ludwig, 1886-1959--Diaries.
Hänsel, Ludwig, 1886-1959--Friends and associates.
Philosophers--Austria--Vienna--19th century.
Teachers--Austria--Vienna--Biography.
Wittgenstein, Ludwig, 1889-1951--Friends and associates.
Princeton subject headings:
Diaries.
Hänsel, Ludwig, 1886-1959--Diaries.
Teachers--Austria--Diaries.
Wittgenstein, Ludwig, 1889-1951--Friends and associates--Diaries.
Wittgenstein, Ludwig, 1889-1951.