Columbia subject headings:
Germany (East)--Economic conditions.
Germany (East)--Social conditions.
Industries--Germany (East)
Harvard subject headings:
Brandenburg (Germany : State)--Economic conditions.
Brandenburg (Germany : State)--Social conditions.
Prussia (Germany)--Economic conditions.
Prussia (Germany)--Social conditions.
Silesia--Economic conditions.
Silesia--Social conditions.
Princeton subject headings:
Industries--Silesia, Upper (Poland and Czech Republic)--History.
Prussia (Germany)--Economic conditions.
Prussia (Germany)--Social conditions.