Rock drill invention by John Christiansen in connection with the Hoosac Tunnel

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Rock drill invention by John Christiansen in connection with the Hoosac Tunnel

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Title:	Rock drill invention by John Christiansen in connection with the Hoosac Tunnel
URI:	http://hdl.handle.net/2452/48673
Date:	1866

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Hoosac Tunnel Photographs [112]

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