Columbia subject headings:
Harvard subject headings:
Authors, German--20th century--Correspondence
Benn, Gottfried, 1886-1956--Correspondence.
Seyerlen, Egmont, 1889-1972--Correspondence.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Benn, Gottfried, 1886-1956. Correspondence.
Seyerlen, Egmont, 1889-1972--Correspondence.