Columbia subject headings:
Authors, German--20th century--Correspondence.
Brückner, Christine, 1921-1996--Correspondence.
Kühner, Otto Heinrich--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Brückner, Christine, 1921-1996--Correspondence.
Kühner, Otto Heinrich--Correspondence.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Brückner, Christine, 1921-1996--Correspondence.
Kühner, Otto Heinrich--Correspondence.