Columbia subject headings:
Family-owned business enterprises--Germany--Rhineland--History--19th century--Congresses.
Family-owned business enterprises--Germany--Rhineland--History--20th century--Congresses.
Harvard subject headings:
Family corporations--Germany--Rhineland--History--19th century--Congresses.
Family corporations--Germany--Rhineland--History--20th century--Congresses.
Family-owned business enterprises--Germany--Rhineland--History--19th century--Congresses.
Family-owned business enterprises--Germany--Rhineland--History--20th century--Congresses.
Princeton subject headings:
Family corporations--Germany--Rhineland--History--19th century--Congresses.
Family corporations--Germany--Rhineland--History--20th century--Congresses.
Family-owned business enterprises--Germany--Rhineland--History--19th century--Congresses.
Family-owned business enterprises--Germany--Rhineland--History--20th century--Congresses.