Columbia subject headings:
Harvard subject headings:
Germany--Commercial policy--History--Congresses.
Germany--Economic conditions--Congresses.
Germany--Social conditions--Congresses.
Tariff--Germany--History--Congresses.
Princeton subject headings:
Germany (West)--Commercial policy--History--Congresses.
Germany--Commercial policy--History--Congresses.
Non-tariff trade barriers--Germany (West)--History--Congresses.
Non-tariff trade barriers--Germany--History--Congresses.