File:Arnold (1913) pg 233 - Contour study of tunnel alignment.jpg
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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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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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