Columbia subject headings:
Harvard subject headings:
Authors, German--Austria--Vienna--Biography--Congresses.
Authors, German--Germany--Berlin--Biography--Congresses.
Berlin (Germany)--Intellectual life--Congresses.
Berlin (Germany)--Relations--Austria--Vienna--Congresses.
Vienna (Austria)--Intellectual life--Congresses.
Vienna (Austria)--Relations--Germany--Berlin--Congresses.
Princeton subject headings:
Authors, German--Austria--Vienna--Biography--Congresses.
Authors, German--Germany--Berlin--Biography--Congresses.
Berlin (Germany)--Intellectual life--Congresses.
Berlin (Germany)--Relations--Austria--Vienna--Congresses.
Vienna (Austria)--Intellectual life--Congresses.
Vienna (Austria)--Relations--Germany--Berlin--Congresses.