Columbia subject headings:
Harvard subject headings:
Germany--Economic conditions--20th century.
Industrie-Club e.V. Düsseldorf--History.
Industrie-Club e.V. Düsseldorf.
Lectures and lecturing--Germany--Düsseldorf.
Speeches, addresses, etc.
Princeton subject headings:
Industrie-Club e.V. Düsseldorf.
Lectures and lecturing--Germany--Düsseldorf.
Speeches, addresses, etc.