Borussia Dortmund on Twitter: "Happy Birthday to the world's greatest stadium! 💛🏟 How it started: How it's going: https://t.co/jeGRPURbbn" / Twitter
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Borussia Dortmund's Signal Iduna Park expansion: Germany's biggest stadium set to get bigger! | Bundesliga
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Borussia Dortmund's 'yellow wall' stands tall in face of attack on team | Borussia Dortmund | The Guardian
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