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Chicago Tower Skydeck Cracks Under Visitors' Feet (VIDEO, PHOTOS) - 12.06.2019, Sputnik International
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Chicago skyscraper's viewing deck cracks under tourists' feet – 1,353ft up | Architecture | The Guardian
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Advanced Interlayer Solutions Division: Laminated glass strength and clarity reach new heights at Skydeck Chicago
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Tourists in glass balcony skydeck observation deck view Chicago skyline103rd floor of the Willis Tower Sears Tower Stock Photo - Alamy
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File:Glass Balconies, Looking West from Willis Tower Skydeck, Chicago, Illinois (9179377925).jpg - Wikimedia Commons
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