Columbia subject headings:
Employers' associations--Germany--History.
Germany--Economic conditions--1888-1918.
Iron industry and trade--Germany--History.
Metal trade--Germany--History.
Harvard subject headings:
Employers' associations--Germany--History.
Germany--Economic conditions--1888-1918.
Iron industry and trade--Germany--History.
Metal trade--Germany--History.
Princeton subject headings:
Employers' associations--Germany--History.
Germany--Economic conditions--1888-1918.
Iron industry and trade--Germany--History.
Metal trade--Germany--History.