Columbia subject headings:
Baden (Germany)--Commerce--History.
Tariff--Germany--Baden--History.
Harvard subject headings:
Baden (Germany)--Commerce--History.
Tariff--Germany--Baden--History.
Princeton subject headings:
Baden (Germany)--Commerce--History.
Customs unions--History.
Deutscher Zollverein--History.
Germany--Commerce--History.
Germany--Economic policy--History.