Columbia subject headings:
Families--Economic aspects--Germany--Westphalia--History--20th century--Congresses.
Family-owned business enterprises--Germany--Westphalia--History--19th century--Congresses.
Harvard subject headings:
Families--Economic aspects--Germany--Westphalia--History--20th century--Congresses.
Family-owned business enterprises--Germany--Westphalia--History--19th century--Congresses.
Princeton subject headings:
Families--Economic aspects--Germany--Westphalia--History--20th century--Congresses.
Family-owned business enterprises--Germany--Westphalia--History--19th century--Congresses.