File:Fig 08 - Completed Arch and I-Beam Centers; View Along Top of Core, Tunnel No. 4.jpg
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Fig_08_-_Completed_Arch_and_I-Beam_Centers;_View_Along_Top_of_Core,_Tunnel_No._4.jpg (566 × 530 pixels, file size: 91 KB, MIME type: image/jpeg)