Columbia subject headings:
Silesia--Civilization--Congresses.
Silesia--History--Congresses.
Silesia--Politics and government--Congresses.
Harvard subject headings:
Silesia--Civilization--Congresses.
Silesia--History--Congresses.
Silesia--Politics and government--Congresses.
Princeton subject headings:
Religion and state--Silesia--Congresses.
Silesia--History--Congresses.
Silesia--Politics and government--Congresses.