Columbia subject headings:
Harvard subject headings:
Germans--Poland--Silesia (Voivodeship)
Silesia (Poland : Voivodeship)--Ethnic relations.
Silesia, Upper (Poland and Czech Republic)--Ethnic relations.
Princeton subject headings:
Germans--Silesia, Upper (Poland and Czech Republic)--Social conditions.
Silesia, Upper (Poland and Czech Republic)--History--20th century.