Engraved diagram showing the method of work in the Hoosac Tunnel, the first rock tunnel in America.

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Size: 8157px × 2571px
Location:
Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 19th, america, archival, archive, century, diagram, engraving, historic, historical, history, hoosac, massachusetts, nitro-glycerine, range, rock, tunnel, workmen