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Driving Bench Work and Dumping from Heading

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Driving Bench Work and Dumping from Heading.jpg Sinking Central Shaft, Hoosac TunnelThumbnailsGeorge M. MowbraySinking Central Shaft, Hoosac TunnelThumbnailsGeorge M. MowbraySinking Central Shaft, Hoosac TunnelThumbnailsGeorge M. MowbraySinking Central Shaft, Hoosac TunnelThumbnailsGeorge M. MowbraySinking Central Shaft, Hoosac TunnelThumbnailsGeorge M. Mowbray