Columbia subject headings:
France--Commerce--Germany.
Germany--Commerce--France.
Germany--Commerce--Great Britain.
Great Britain--Commerce--Germany.
Harvard subject headings:
France--Commerce--Germany.
Germany--Commerce--France.
Germany--Commerce--Great Britain.
Great Britain--Commerce--Germany.
Princeton subject headings:
France--Commerce--Germany.
Germany--Commerce--France.
Germany--Commerce--Great Britain.
Great Britain--Commerce--Germany.