Columbia subject headings:
Harvard subject headings:
Boards of trade--Germany (East)--History.
Commercial associations--Germany (East)--History.
Deutscher Industrie- und Handelstag--History.
Germany (East)--Commerce--History.
Princeton subject headings:
Boards of trade--Germany (East)--History.
Commercial associations--Germany (East)--History.
Deutscher Industrie- und Handelstag--History.
Germany (East)--Commerce--History.