Related Clues:
- Bad ___ (Lower Saxony city)
- City of the Ruhr valley
- City near Düsseldorf
- It's near Gelsenkirchen
- Krupp steel hub
- Chief city of the Ruhr River valley
- Ruhr region
- Industrial city in Germany
- City near Oberhausen
- City in the Ruhr valley
- German iron and steel center
- Steel city of Europe
- Ruhr-al city?
- Krupp's headquarters
- Where the Krupps worked