Columbia subject headings:
Benn, Gottfried, 1886-1956--Correspondence.
Benn, Gottfried, 1886-1956--Friends and associates.
Love letters.
Pfau, Gerda--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Benn, Gottfried, 1886-1956. Correspondence
Pfau, Gerda--Correspondence.
Princeton subject headings:
Benn, Gottfried, 1886-1956--Friends and associates.
Benn, Gottfried, 1886-1956. Correspondence.
Personal correspondence.
Pfau, Gerda--Correspondence.