Columbia subject headings:
Handke, Peter--Correspondence.
Unseld, Siegfried--Correspondence.
Harvard subject headings:
Authors, Austrian--20th century--Correspondence
Authors, German--20th century--Correspondence
Handke, Peter--Correspondence.
Publishers and publishing--Germany--Correspondence
Unseld, Siegfried--Correspondence.
Princeton subject headings:
Handke, Peter--Correspondence.
Personal correspondence.
Unseld, Siegfried--Correspondence.