File:AmCyc Tunnel - tunneling through loose rock (front view).jpg
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Size of this preview: 691 × 600 pixels. Other resolutions: 277 × 240 pixels | 553 × 480 pixels | 895 × 777 pixels.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:51, 4 January 2013 | 895 × 777 (223 KB) | Bob Burkhardt | {{Information |Description={{en|Cross section of a railroad tunnel being constructed through loose rock, viewed head on.}} |Source=''The American Cyclopædia'', v. 16, 1879, p. 34. |Date=1879 |Author=unknown artist; article by Henry S. Drinker |Permiss... |
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