Columbia subject headings:
Authors, German--20th century--Correspondence.
Celan, Paul--Correspondence.
Kloos-Barendregt, Diet, 1924---Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Celan, Paul--Correspondence.
Kloos-Barendregt, Diet, 1924---Correspondence.
Princeton subject headings:
Authors, Germany--20th century--Correspondence.
Celan, Paul--Correspondence.
Kloos-Barendregt, Diet, 1924-