Columbia subject headings:
Harvard subject headings:
Silesia, Upper (Poland and Czech Republic)--History--Congresses.
Princeton subject headings:
Silesia, Upper (Poland and Czech Republic)--Ethnic relations--Congresses.
Silesia, Upper (Poland and Czech Republic)--Historiography--Congresses.
Silesia, Upper (Poland and Czech Republic)--Politics and government--20th century--Congresses.