File:1843 Gerstner Drawing Of Thomas Viaduct.png
Smithsonian National Museum of American History ...
https://edan.si.edu/slideshow/viewer/?eadrefid=NMAH.AC.1086_ref1182
Author
Franz Anton von Gerstner, in his work (1843). Die innern Communicationen der Vereinigten Staaten von Nordamerica. Austria: Förster.
https://en.wikipedia.org/key/Franz_Anton_von_GerstnerLicensing
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