Columbia subject headings:
Authors, German--20th century--Correspondence.
Mann, Thomas, 1875-1955--Correspondence.
Ponten, Josef, 1883-1940--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Mann, Thomas, 1875-1955--Correspondence.
Ponten, Josef, 1883-1940--Correspondence.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Mann, Thomas, 1875-1955--Correspondence.
Ponten, Josef, 1883-1940--Correspondence.