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  4. Bridges and Tunnels  42 Sites
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North America
Canada, United States 37 Sites
William H. Harsha Bridge
No sub-categories 2 Sites
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The Tunnel Page - The longest road and rail tunnels in the world, grouped by categories such as sub-sea tunnels and immersed tubes. Bridge of the Month Quiz - An image is posted inviting entrants to identify the feature. A free copy of a book on the subject is awarded to one correct entrant per month. A Span For All Seasons - A collection of photographs of facilities and a large worldwide inventory of suspension bridges.
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