Columbia subject headings:
Competition, Unfair--Germany--History.
Trade associations--Law and legislation--Germany--History.
Harvard subject headings:
Competition, Unfair--Germany--History.
Competition, Unfair--History.
Professional associations--Law and legislation--Germany--History.
Professional associations--Law and legislation--History.
Trade associations--Law and legislation--Germany--History.
Trade associations--Law and legislation--History.
Princeton subject headings: