| Frederick Gutekunst Allegheny Tunnel 1875 (ca) Stereocard Library Company of Philadelphia Gutekunst Pennsylvania Railroad Stereograph Collection, Record number: 000014650 LL/62005 Depicts the single stone arch of the Allegheny Tunnel in the distance. A row of men stand at the edge of the cliff above the tunnel, looking toward the photographer. Built in 1854 for the Pennsylvania Railroad.
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