File:Arnold (1913) pg 269.jpg
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| Description |
English: Figure 69 - Mission-Sunset Tunnel portal. Typical arrangement of combined traffic and transit tunnel, showing method of utilizing sub-grades for present surface cars and also for a future subway connection directly with Market Street subway bore. |
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| Date | ||||
| Source | Arnold, Bion J. (March 1913) "11. Market Street extension tunnel under Twin Peaks" in Report on the Improvement and Development of the Transportation Facilities of San Francisco, pp. 225–270 Retrieved on 17 April 2018. | |||
| Author | Uncredited illustrator(s), drafter(s), and photographer(s). First published by and generally credited to Bion Arnold | |||
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 16:01, 27 July 2018 | | 2,144 × 1,327 (336 KB) | SteinsplitterBot (talk | contribs) | Bot: Image rotated by 90° |
| 14:38, 27 July 2018 |  | 1,327 × 2,149 (339 KB) | Mliu92 (talk | contribs) | User created page with UploadWizard |
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