Columbia subject headings:
Authors, German--20th century--Correspondence.
Borchardt, Rudolf, 1877-1945--Correspondence.
Hofmannsthal, Hugo von, 1874-1929--Correspondence.
Schröder, Rudolf Alexander, 1878-1962--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Authors, German--20th century--Criticism and interpretation.
Borchardt, Marie Luise--Correspondence.
Borchardt, Marie Luise--Criticism and interpretation.
Borchardt, Rudolf, 1877-1945--Correspondence.
Borchardt, Rudolf, 1877-1945--Criticism and interpretation.
Hofmannsthal, Hugo von, 1874-1929--Correspondence.
Hofmannsthal, Hugo von, 1874-1929--Criticism and interpretation.
Schröder, Rudolf Alexander, 1878-1962--Correspondence.
Schröder, Rudolf Alexander, 1878-1962--Criticism and interpretation.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Borchardt, Rudolf, 1877-1945--Correspondence.
Personal correspondence.