Columbia subject headings:
Harvard subject headings:
Authors, German--20th century--Correspondence
Celan, Paul--Correspondence.
Hirsch, Rudolf, 1905-1996--Correspondence.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Celan, Paul--Correspondence.
Hirsch, Rudolf, 1905-1996--Correspondence.
Publishers and publishing--Germany--Correspondence.