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File:1875 Keystone Bridge Company Ad (cropped).jpg

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Description Callowhill Street Bridge by Keystone Bridge Company.
Date
Source Historic American Engineering Record, http://memory.loc.gov/pnp/habshaer/pa/pa0900/pa0900/photos/140567pv.jpg
Author illegible.
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current21:33, 15 May 2010Thumbnail for version as of 21:33, 15 May 2010960 × 664 (277 KB)BoringHistoryGuy{{Information |Description=Callowhill Street Bridge by Keystone Bridge Company. |Source=Historic American Engineering Record, http://memory.loc.gov/pnp/habshaer/pa/pa0900/pa0900/photos/140567pv.jpg |Date=1875. |Author=illegible. |Permission={{PD-Old}} |ot

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