List of tunnels documented by the Historic American Engineering Record in Pennsylvania
This is a list of tunnels documented by the Historic American Engineering Record in the U.S. state of Pennsylvania.[1]
Tunnels
See also
References
- ↑ Library of Congress. "Prints and Photographs Online Catalog: Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey". Retrieved January 2014. Check date values in:
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External links
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