Columbia subject headings:
Fraternal insurance--Silesia, Upper (Poland and Czech Republic)
Fraternal organizations--Silesia, Upper (Poland and Czech Republic)
Miners--Pensions--Poland.
Harvard subject headings:
Princeton subject headings:
Fraternal insurance--Silesia, Upper (Poland and Czech Republic).
Fraternal organizations--Silesia, Upper (Poland and Czech Republic).
Miners--Pensions--Poland.