File:Arnold (1913) pg 233 - Contour study of tunnel alignment (cropped).jpg
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DescriptionArnold (1913) pg 233 - Contour study of tunnel alignment (cropped).jpg |
English: Figure 53 - Contour study of tunnel alignment. Showing possible alignments at different depths below the street surface for Plan 5B. Based upon established grades and uniform grading between streets. This irutally establishes the range of possible construction except with extensive regrading. |
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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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Public domainPublic domainfalsefalse |
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.
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.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Arnold_(1913)_pg_233_-_Contour_study_of_tunnel_alignment_(cropped).jpg |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:09, 27 July 2018 | 1,062 × 750 (105 KB) | Mliu92 (talk | contribs) | File:Arnold (1913) pg 233 - Contour study of tunnel alignment.jpg cropped 20 % horizontally, 65 % vertically using CropTool with precise mode. |
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