Columbia subject headings:
Fried. Krupp GmbH--History.
Krupp family--History.
Steel industry and trade--Germany--History.
Weapons industry--Germany--History.
Harvard subject headings:
Fried. Krupp GmbH--History.
Krupp family--History.
Steel industry and trade--Germany--History
Weapons industry--Germany--History.
Princeton subject headings:
Fried. Krupp AG.
Krupp family.
Steel industry and trade--Germany--History.