Columbia subject headings:
Heidegger, Martin, 1889-1976--Correspondence.
Philosophers--Germany--Correspondence.
Rickert, Heinrich, 1863-1936--Correspondence.
Harvard subject headings:
Heidegger, Martin, 1889-1976--Correspondence.
Rickert, Heinrich, 1863-1936--Correspondence.
Princeton subject headings:
Heidegger, Martin, 1889-1976--Correspondence.
Rickert, Heinrich, 1863-1936--Correspondence.