Columbia subject headings:
Harvard subject headings:
Frege, Gottlob, 1848-1925.
Heidegger, Martin, 1889-1976
Wittgenstein, Ludwig, 1889-1951
Princeton subject headings:
Frege, Gottlob, 1848-1925.
Heidegger, Martin, 1889-1976.
Wittgenstein, Ludwig, 1889-1951.