Columbia subject headings:
Industries--Poland--Silesia (Voivodeship)--History.
Labor--Poland--Silesia (Voivodeship)--History.
Harvard subject headings:
Industries--Poland--Silesia (Voivodeship)--History.
Working class--Poland--Silesia (Voivodeship)--History.
Princeton subject headings:
Industries--Silesia--History.
Working class--Silesia--History.