Columbia subject headings:
Gussstahlfabrik Fried. Krupp (Essen, Germany)
Krupp family.
Harvard subject headings:
Krupp family.
Krupp'sche Gussstahlfabrik (Essen, Germany)
Princeton subject headings:
Gussstahlfabrik Fried. Krupp (Essen)
Krupp family.