Columbia subject headings:
Hofmannsthal, Hugo von, 1874-1929--Correspondence.
Kassner, Rudolf, 1873-1959--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Hofmannsthal, Hugo von, 1874-1929--Correspondence.
Kassner, Rudolf, 1873-1959--Correspondence.
Princeton subject headings:
Hofmannsthal, Hugo von, 1874-1929--Correspondence.
Kassner, Rudolf, 1873-1959--Correspondence.