Columbia subject headings:
Hesse, Hermann, 1877-1962--Correspondence--Exhibitions.
Hesse, Martin--Correspondence--Exhibitions.
Harvard subject headings:
Authors, German--20th century--Correspondence--Exhibitions.
Hesse, Hermann, 1877-1962--Correspondence--Exhibitions.
Hesse, Hermann, 1877-1962--Exhibitions.
Hesse, Martin--Correspondence--Exhibitions.
Hesse, Martin--Exhibitions.
Princeton subject headings:
Hesse, Hermann, 1877-1962--Correspondence--Exhibitions.
Hesse, Martin--Correspondence--Exhibitions.