https://www.youtube.com/watch?v=YFeU6SSmpv8
http://America's Tallest Building Video - Chicago - HISTORY.com
http://www.bbc.com/news/resources/idt-3cca82c0-af80-4c3a-8a79-84fda5015115
https://www.youtube.com/watch?v=YFeU6SSmpv8
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