Columbia subject headings:
Harvard subject headings:
Silesia--Civilization--Congresses.
Silesia--Ethnic relations--History--Congresses.
Silesia--History--Congresses.
Silesia--Intellectual life--History--Congresses.
Princeton subject headings:
Silesia--Civilization--Congresses.
Silesia--Ethnic relations--Congresses.
Silesia--History--Congresses.
Silesia--Intellectual life--Congresses.