Columbia subject headings:
Germans--Silesia.
Minorities--Silesia, Upper (Poland and Czech Republic)
Minorities--Silesia.
Polish people--Silesia.
Harvard subject headings:
Germans--Silesia.
Minorities--Germany--Upper Silesia.
Minorities--Silesia, Upper (Poland and Czech Republic)
Minorities--Silesia.
Polish people--Silesia
Princeton subject headings: