Columbia subject headings:
Harvard subject headings:
Authors, German--20th century--Correspondence
Bender, Hans, 1919-2015--Correspondence.
Lenz, Hermann, 1913-1998--Correspondence.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Bender, Hans, 1919-2015--Correspondence.
Lenz, Hermann, 1913-1998--Correspondence.
Personal correspondence.