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Bridge and Tunnel Centers
Provides an index of the pages included in the publication presented by the University of Michigan.
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Catskill Archive - Hoosac Tunnel
Indicates the construction details of the edifice as well as historical records and gallery of pictures and illustrations.
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Commissioner's Report - Sutro Tunnel
Indexes the contents of the book that provides details on loan recommendation for the construction and other works.
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FranklinSites.com - Hoosac
Relevant information about structures as well as adventures presented providing insights to the tourism in the region.
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Letter from the Secretary of War - Sutro Tunnel
Published reference on the commission's report on examination activity conducted in the structure.
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Mike's Railway History
Reference for the construction of tunnels from previous years up until the year 1935. Features historical pictures and illustrations.
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Modern History Sourcebook - Francis Fox
Exposition on the procedures and related information about the Swiss' construction of well-known tunnel during the year 1905.
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Mount Cenis Railway and Tunnel
Narrative on the project initiative as well as discussion of relevant matters and illustration of the route.
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Severn Railway Tunnel
Description on the building of the structure as well as other details on the project. Also provides an illustration on its covered areas.
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St. Clair Tunnel Company
Historical reference for the commercial firm's operations including details on its engineering projects.
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Standedge Tunnel
British underground structure believed to be the highest, deepest and longest. Includes details on restoration activities.
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Superintendent's Report - Sutro Tunnel Company
Content index of the publication that documents the construction operations of the commercial firm from a direct supervisor's records.
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Tunnel of Eupalinos
Narrative of the history of the tunnel's construction during the ancient times.
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Tunnel of Samos
Points out the construction of the structure in the Greek island including details on its usage during ancient times.