Columbia subject headings:
Germany--History--1871-1918.
Grain trade--Germany--History.
Tariff--Germany--History.
Harvard subject headings:
Germany--Commercial policy--History--19th century.
Germany--Commercial policy--History--20th century.
Germany--Commercial policy.
Germany--Economic conditions--19th century.
Germany--Economic conditions--20th century.
Grain trade--Germany--History--19th century.
Grain trade--Germany--History--20th century.
Tariff--Germany--History--19th century.
Tariff--Germany--History--20th century.
Princeton subject headings:
Germany--Commercial policy--History--19th century.
Germany--Commercial policy--History--20th century.
Germany--Economic conditions--19th century.
Germany--Economic conditions--20th century.
Grain trade--Germany--History--19th century.
Grain trade--Germany--History--20th century.
Tariff--Germany--History--19th century.
Tariff--Germany--History--20th century.