Columbia subject headings:
Harvard subject headings:
Business enterprises--Germany--History--19th century.
Fried. Krupp AG--History.
Germany--Economic conditions--19th century.
Krupp, Friedrich, 1787-1826.
Steel industry and trade--Germany--History--19th century.
Steel-works--Germany--Essen--History--19th century.
Weapons industry--Germany--History--19th century.
Princeton subject headings:
Business enterprises--Germany--History--19th century.
Fried. Krupp AG--History.
Germany--Economic conditions--19th century.
Steel industry and trade--Germany--History--19th century.
Steel-works--Germany--Essen--History--19th century.
Weapons industry--Germany--History--19th century.