Columbia subject headings:
Hesse, Hermann, 1877-1962--Congresses.
Harvard subject headings:
Hesse, Hermann, 1877-1962--Congresses.
Princeton subject headings:
Authors, German--20th century--Biography--Congresses.
Hesse, Hermann, 1877-1962--Congresses.
Hesse, Hermann, 1877-1962--Friends and associates--Congresses.