Columbia subject headings:
Authors, German--20th century--Correspondence.
Becker, Jürgen, 1932---Correspondence.
Heissenbüttel, Helmut, 1921-1996--Correspondence.
Literature, Experimental.
Harvard subject headings:
Authors, German--20th century--Correspondence
Becker, Jürgen, 1932---Correspondence.
Heissenbüttel, Helmut, 1921-1996--Correspondence.
Literature, Experimental
Princeton subject headings:
Authors, German--20th century--Correspondence.
Becker, Jürgen, 1932---Correspondence.
Heissenbüttel, Helmut, 1921-1996--Correspondence.
Literature, Experimental.
Personal correspondence.