File:Fig 03 - Top Level in Advance of Brick Arch, Showing I-Beam Centers, Tunnel No. 4.jpg
Jump to navigation
Jump to search
Size of this preview: 800 × 579 pixels. Other resolutions: 320 × 231 pixels | 640 × 463 pixels | 838 × 606 pixels.
Original file (838 × 606 pixels, file size: 136 KB, MIME type: image/jpeg)