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Massachusetts / U.S. Route 1 / Interstate 93 / Boston Harbor / Bridges / Tunnel / Big Dig / Transatlantic tunnel / Extreme Engineering / Interstate Highway System / Transportation in the United States / Transportation in Boston / Massachusetts


http://science.howstuffworks.com/engineering/structural/tunnel Adventure
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Document Date: 2013-12-21 23:24:57

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File Size: 128,61 KB

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