The Pennsylvania Turnpike: America's First Superhighway

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Further Reading:
https://www.npr.org/2021/04/07/984784....
https://www.webpages.uidaho.edu/niatt...
https://www.smithsonianmag.com/smart-....
https://www.nps.gov/alpo/learn/histor...
https://www.britannica.com/money/Penn...
https://highways.dot.gov/highway-hist...
https://archives.house.state.pa.us/pe...
https://www.paturnpike.com/about-us/t...
https://www.amazon.com/Railroad-That-...
https://americanbusinesshistory.org/t...
https://www.nps.gov/shen/learn/histor...
  / the-stairway-to-heaven-is-closed  
https://www.paturnpike.com/traveling/...
https://www.pittsburghmagazine.com/th...
https://www.thereporteronline.com/201...

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