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Description
English: Cross-section view of the Twin Peaks Tunnel, western end. Redrawn from plans published in 1916. Scale 10px = 1"
Date
Source Own work, redrawn from Glick, L. (21 June 1916). " Method and Progress of Construction of the Twin Peaks Tunnel In San Francisco, Cal.". Building and Engineering News 16 (24): 5–13. Retrieved on 24 July 2018.
Author Mliu92
Other versions This file was derived from: B&EN v16 no 24 fig04 pg06 (1916-06-24) Tunnel Section in Soft Ground.jpg

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25 July 2018

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Date/TimeThumbnailDimensionsUserComment
current 14:40, 25 July 2018 Thumbnail for version as of 14:40, 25 July 20183,660 × 3,440 (1 KB)Mliu92User created page with UploadWizard
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