Columbia subject headings:
Harvard subject headings:
Family-owned business enterprises--Germany--Essen--History--Exhibitions.
Fried. Krupp AG--History--Exhibitions.
Krupp family--Exhibitions.
Steel industry and trade--Germany--Essen--History--Exhibitions.
Weapons industry--Germany--History--Exhibitions.
Princeton subject headings:
Fried. Krupp GmbH--History--Exhibitions.
Krupp family--History--Exhibitions.
Steel industry and trade--Germany--History--Exhibitions.