The aircraft crashes that changed the world of aviation. And the reason aircraft windows aren't square.
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A number of books cover the crash of the aircraft, but Henry Petroski's To Engineer is Human is one of the best: https://www.amazon.com/Engineer-Human-Failure-Successful-Design/dp/0679734163
There are a number of documentaries on YouTube, including: https://www.youtube.com/watch?v=68XH9r4FyNs