Columbia subject headings:
Industries--Prussia, East (Poland and Russia)--History.
Prussia, East (Poland and Russia)--Economic conditions.
Prussia, East (Poland and Russia)--Politics and government.
Harvard subject headings:
Industries--Prussia, East (Poland and Russia)--History.
Prussia, East (Poland and Russia)--Economic conditions.
Prussia, East (Poland and Russia)--Politics and government.
Princeton subject headings:
Prussia, East (Poland and Russia)--History.