Related Clues:
- Ruhr Valley metropolis
- ThyssenKrupp headquarters city
- City in the Ruhr basin
- 1802 acquisition of 25-Across
- To eat, to Dieter
- Ruhr's chief city
- City NW of Frankfurt
- City west of Dortmund
- Krupp steelworks city
- City WSW of Dortmund
- Large city of the Ruhr valley
- Prussia annexed it in 1802
- Home of the Krupp family
- Steel city of Germany
- German city north of Cologne