Columbia subject headings:
Harvard subject headings:
Heidegger, Martin, 1889-1976
Philosophers--Austria--Biography
Philosophers--Germany--Biography
Philosophy--History--20th century.
Wittgenstein, Ludwig, 1889-1951
Princeton subject headings:
Heidegger, Martin, 1889-1976.
Philosophers--Austria--Biography.
Philosophers--Germany--Biography.
Philosophy--History--20th century.
Wittgenstein, Ludwig, 1889-1951.