Columbia subject headings:
Simmel, Georg, 1858-1918.
Harvard subject headings:
Simmel, Georg, 1858-1918--Congresses.
Simmel, Georg, 1858-1918--Views on modernism (Aesthetics)--Congresses.
Sociology--Germany--History--Congresses.
Princeton subject headings:
Simmel, Georg, 1858-1918.