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Philadelphia and Lancaster Turnpike - Wikipedia
History of turnpikes and canals in the United States - Wikipedia
Turnpikes and Toll Roads in Nineteenth-Century America
America’s first toll road: The Philadelphia & Lancaster Turnpike
Turnpikes - Encyclopedia of Greater Philadelphia
PA Turnpike History
1795 - The Philadelphia and Lancaster Turnpike Road
The Cumberland Road - National Geographic Society
Turnpikes (Toll Roads) for kids - American Historama
The Building of the Great Pennsylvania Turnpike