Columbia subject headings:
Germany--Intellectual life--20th century.
Sociologists--Germany--Correspondence.
Sombart, Werner, 1863-1941--Correspondence.
Harvard subject headings:
Germany--Intellectual life--20th century
Sociologists--Germany--Correspondence.
Sombart, Werner, 1863-1941--Correspondence.
Princeton subject headings:
Germany--Intellectual life--20th century.
Personal correspondence.
Sociologists--Germany--Correspondence.
Sombart, Werner, 1863-1941--Correspondence.