Columbia subject headings:
Hesse, Hermann, 1877-1962--Correspondence.
Kubin, Alfred, 1877-1959--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Hesse, Hermann, 1877-1962.--Correspondence.
Kubin, Alfred, 1877-1959--Correspondence.
Princeton subject headings:
Hesse, Hermann, 1877-1962. Correspondence.
Kubin, Alfred, 1877-1959--Correspondence.