Columbia subject headings:
Harvard subject headings:
Agriculture and state--Germany--Prussia--History.
Grain trade--England--History.
Grain trade--Germany--Prussia--History.
Industries--England--History.
Serfdom--Germany--Prussia--History.
Princeton subject headings:
Agriculture and state--Prussia (Kingdom)--History.
Grain trade--England--History.
Grain trade--Prussia (Kingdom)--History.
Industries--England--History.
Serfdom--Prussia (Kingdom)--History.