Columbia subject headings:
Harvard subject headings:
Austria--History--Congresses.
Austria--Relations--Silesia--Congresses.
German literature--History and criticism--Congresses
Silesia--History--Congresses.
Silesia--Relations--Austria--Congresses.
Princeton subject headings:
Cultural relations.
Vienna (Austria)--Civilization.
Vienna (Austria)--Relations--Poland--Wrocław.
Wrocław (Poland)--Civilization.
Wrocław (Poland)--Relations--Austria--Vienna.