Columbia subject headings:
Authors and publishers--Correspondence.
Authors, German--20th century--Correspondence.
Grass, Günter, 1927-2015--Correspondence.
Wolff, Helen, 1906-1994--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Grass, Günter, 1927-2015--Correspondence.
Wolff, Helen, 1906-1994--Correspondence.
Princeton subject headings:
Grass, Günter, 1927-2015--Correspondence.
Personal correspondence.
Wolff, Helen, 1906-1988--Correspondence.