Building Big: World Trade Center
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Scan day: 19 February 2014 UTC
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Description: Explains how the towers of the World Trade Center were constructed and what factors led to their collapse. From PBS.
BUILDING BIG: Databank: World Trade Center 1972 (Tower One), 1973 (Tower Two) 1,368 feet (Tower One), 1,362 feet (Tower Two) Skilling, Helle, Christiansen & Robertson Constructed by the Port Authority of New York and New Jersey in the early 1970s, the World Trade Center towers were, for their time, the best known examples of tube buildings. Tube buildings are strengthened by closely spaced columns and beams in the outer walls. The closely spaced
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| Page title: | BUILDING BIG: Databank: World Trade Center |
| Keywords: | World Trade Center, Skyscraper, Steel, Skilling, Helle, Christiansen & Robertson |
| Description: | Building Big Databank entry on World Trade Center |
| IP-address: | 54.211.64.28 |