File:Twin Peaks Tunnel and Observatory, Aug 1910 (SF Call) +curves.png
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Summary
| Description |
English: Illustration of Twin Peaks and tunnel cutaway. Signed "A.R. Hunt". Published in San Francisco Call, August 20, 1910. |
| Date | |
| Source | (20 August 1910). "Convention solves engineering problem". San Francisco Call. Retrieved on 23 July 2018. |
| Author | A. R. Hunt |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:08, 23 July 2018 | | 3,463 × 1,302 (3.33 MB) | Mliu92 | User created page with UploadWizard |
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