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Ruhr - Wikipedia
Ruhr | Region, Cities, Map, & Facts | Britannica
Ruhr (river) - Wikipedia
History of the Ruhr - Wikipedia
Ruhr River | Facts, Map, & Length | Britannica
Discover Germany’s Industrial Heritage - National Geographic
The Ruhr valley: Come and be amazed! - Germany Travel
Ruhr – Travel guide at Wikivoyage
Ruhr - Wikiwand
Metropole Ruhr - Metropolis Ruhr