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[–] new4now 0 points 2 points (+2|-0) ago 

here's a vid of the making of the towers

https://youtu.be/Jwc49cZKunQ

design and materials used

https://science.howstuffworks.com/engineering/structural/world-trade-center-construction-unique2.htm

a little more on the buildings and the companies involved

https://en.m.wikipedia.org/wiki/Construction_of_the_World_Trade_Center

will look through this when I get a chance