File:Fig 03 - Top Level in Advance of Brick Arch, Showing I-Beam Centers, Tunnel No. 4.jpg
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![File:Fig 03 - Top Level in Advance of Brick Arch, Showing I-Beam Centers, Tunnel No. 4.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Fig_03_-_Top_Level_in_Advance_of_Brick_Arch%2C_Showing_I-Beam_Centers%2C_Tunnel_No._4.jpg/800px-Fig_03_-_Top_Level_in_Advance_of_Brick_Arch%2C_Showing_I-Beam_Centers%2C_Tunnel_No._4.jpg?20180520062143)
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