Columbia subject headings:
Heidegger, Martin, 1889-1976--Correspondence.
Müller, Max, 1906-1994--Correspondence.
Harvard subject headings:
Heidegger, Martin, 1889-1976--Correspondence.
Müller, Max, 1906-1994--Correspondence.
Philosophers--Germany--Correspondence
Philosophy, German--20th century.
Princeton subject headings:
Heidegger, Martin, 1889-1976--Correspondence.
Müller, Max, 1906-1994--Correspondence.