Columbia subject headings:
Heidegger, Martin, 1889-1976--Correspondence.
Welte, Bernhard--Correspondence.
Harvard subject headings:
Heidegger, Martin, 1889-1976--Correspondence.
Welte, Bernhard--Correspondence.
Princeton subject headings:
Heidegger, Martin, 1889-1976--Correspondence.
Welte, Bernhard--Correspondence.