Columbia subject headings:
Harvard subject headings:
Liefmann, Emil--Correspondence.
Mann, Thomas, 1875-1955--Correspondence.
Princeton subject headings:
Authors, German--Correspondence.
Jewish physicians--Germany--Correspondence.
Liefmann, Emil, 1878-1955--Correspondence.
Mann, Thomas, 1875-1955--Correspondence.
Physicians--Germany--Correspondence.