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Duisburg - Wikipedia
Duisburg | History, Population, & Points of Interest | Britannica
25 Best Things to Do in Duisburg (Germany) - The Crazy Tourist
Welcome to Duisburg | Visit Duisburg
The Top 10 Things to See and Do in Duisburg, Germany
Duisburg and the Ruhr valley: A bustling region - Germany Travel
Duisburg Travel Guide: Top Things to Do, See and Eat in Duisburg
THE 15 BEST Things to Do in Duisburg - Tripadvisor
Duisburg – Travel guide at Wikivoyage
Tourism in Duisburg, Germany - Europe's Best Destinations