Arnold (1913) pg 269.jpg
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Summary
| 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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_pg_269_(cropped).jpg)
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Licensing
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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, 1930.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:01, 27 July 2018 | | 2,144 × 1,327 (336 KB) | wikimediacommons>SteinsplitterBot | Bot: Image rotated by 90° |
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