Columbia subject headings:
Businessmen--Germany--North Rhine-Westphalia--Biography.
Businessmen--Germany--Rhine Province--Biography.
Capitalists and financiers--Germany--North Rhine-Westphalia--Biography.
Capitalists and financiers--Germany--Rhine Province--Biography.
Harvard subject headings:
Businesspeople--Germany--North Rhine-Westphalia--Biography.
Businesspeople--Germany--Rhine Province--Biography.
Capitalists and financiers--Germany--North Rhine-Westphalia--Biography.
Capitalists and financiers--Germany--Rhine Province--Biography.
Princeton subject headings:
Businesspeople--Germany--North Rhine-Westphalia--Biography.
Businesspeople--Germany--Rhine Province--Biography.
Capitalists and financiers--Germany--North Rhine-Westphalia--Biography.
Capitalists and financiers--Germany--Rhine Province--Biography.