Columbia subject headings:
Harvard subject headings:
Hamburg (Germany)--Commerce--History.
Hamburg (Germany)--Economic conditions.
Handelskammer Hamburg--History.
Schmidt, Helmut, 1918-2015.
Princeton subject headings:
Hamburg (Germany)--Commerce--History.
Hamburg (Germany)--Economic conditions.
Handelskammer Hamburg--History.
Schmidt, Helmut, 1918-2015.