Columbia subject headings:
Entrepreneurship.
Industries--Germany (West)--History.
Industries--Germany--Rhineland--History.
Small business--Germany--Cologne--History.
Harvard subject headings:
Entrepreneurship.
Industries--Germany (West)--History.
Industries--Germany--Rhineland--History.
Small business--Germany--Cologne--History.
Princeton subject headings:
Businessmen--Germany--Cologne--Exhibitions.
Industries--Germany (West)--Exhibitions.