File:Fig 07 - North End of Tunnel No. 3.jpg
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![File:Fig 07 - North End of Tunnel No. 3.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Fig_07_-_North_End_of_Tunnel_No._3.jpg/800px-Fig_07_-_North_End_of_Tunnel_No._3.jpg?20180520062148)
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