1977- The Francis Scott Key Bridge, a steel arch-shaped continuous through truss bridge, opens in Maryland.
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https://m.youtube.com/watch?v=PzXfXTeYdV4
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https://youtu.be/oKPDGUqAtyU
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https://youtu.be/WvljI0VIq-E
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https://youtu.be/cc-CB4cmssQ
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https://youtu.be/Sfx5IwsNU9o
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https://youtu.be/a8E2AApMqnk
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https://youtu.be/nJOIpIVnikI
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https://youtu.be/XXhmblzSAeU
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https://youtu.be/ZoSdKLR0x6o