Columbia subject headings:
Harvard subject headings:
Authors, German--20th century--Correspondence
Celan, Paul--Correspondence.
Szondi, Peter--Correspondence.
Princeton subject headings:
Authors--20th century.
Bollack, Jean--Correspondence.
Bollack, Mayotte--Correspondence.
Celan, Paul--Correspondence.
Celan-Lestrange, Gisèle--Correspondence.
Personal correspondence.
Szondi, Peter--Correspondence.