Columbia subject headings:
Boards of trade--Europe, German-speaking.
Industrial relations--Europe, German-speaking.
Trade associations--Europe, German-speaking.
Harvard subject headings:
Boards of trade--Europe, German-speaking.
Industrial relations--Europe, German-speaking.
Labor unions--Europe, German-speaking.
Trade associations--Europe, German-speaking.
Princeton subject headings:
Boards of trade--Europe, German-speaking.
Industrial relations--Europe, German-speaking.
Trade associations--Europe, German-speaking.