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Ruhr - Wikipedia
Ruhr | Region, Cities, Map, & Facts | Britannica
Rhine-Ruhr metropolitan region - Wikipedia
North Rhine-Westphalia - Wikipedia
Ruhr Map - North Rhine-Westphalia, Germany - Mapcarta
Ruhr – Travel guide at Wikivoyage
North Rhine–Westphalia | State in Germany, Industry, Economy, …
Welcome to North Rhine-Westphalia - Land.NRW
Ruhr - Wikiwand
North Rhine-Westphalia – Travel guide at Wikivoyage