Columbia subject headings:
Agriculture and state--Germany.
Germany--Commercial policy.
Harvard subject headings:
Agriculture and state--Germany.
Germany--Commercial policy.
Princeton subject headings:
Agriculture and state--Germany--History--19th century.
Agriculture and state--Germany--History--20th century.
Germany--Economic policy--1888-1918.
Tariff on farm produce--Germany--History--19th century.
Tariff on farm produce--Germany--History--20th century.