File:Fig 13 - South End of Tunnel No. 4.jpg
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![File:Fig 13 - South End of Tunnel No. 4.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Fig_13_-_South_End_of_Tunnel_No._4.jpg/800px-Fig_13_-_South_End_of_Tunnel_No._4.jpg?20180520062153)
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