File:B&EN v16 no 24 cover (1916-06-24).jpg
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| Description |
English: Caption: Steel Forms Used In Concreting The Twin Peaks Tunnel |
| Date | |
| Source | Glick, L. (21 June 1916). "Method and Progress of Construction of the Twin Peaks Tunnel In San Francisco, Cal.". Building and Engineering News 16 (24): 5–13. Retrieved on 24 July 2018. |
| Author | Unknown illustrator(s) and/or photographer(s). |
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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 | |
|---|---|---|---|---|---|
| current | 15:34, 25 July 2018 | | 1,812 × 1,467 (577 KB) | Mliu92 (talk | contribs) | User created page with UploadWizard |
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