Columbia subject headings:
Fried. Krupp AG--History.
Labor unions--Germany--History--19th century.
Manpower planning--Germany--History--19th century.
Working class--Germany--History--19th century.
Harvard subject headings:
Fried. Krupp AG--History.
Labor unions--Germany--History--19th century.
Manpower planning--Germany--History--19th century.
Working class--Germany--Economic conditions.
Princeton subject headings:
Fried. Krupp AG--History--19th century.
Krupp, Alfred, 1812-1887.
Labor unions--Germany--History--19th century.
Steel industry and trade--Germany--History--19th century.