Reconnaissance Report, Part II, Limited Access Highway, Interstate Highway System, Relocation of U.S. Route 19 from Penn Lincoln Parkway--Pittsburgh, PA to Pennsylvania Turnpike near Warrendale, PA., Submitted to the Pennsylvania Department of Highways by Richardson, Gordon and Associates, 1957

Reconnaissance Report, Part II, Limited Access Highway, Interstate Highway System, Relocation of U.S. Route 19 from Penn Lincoln Parkway--Pittsburgh, PA to Pennsylvania Turnpike near Warrendale, PA., Submitted to the Pennsylvania Department of Highways by Richardson, Gordon and Associates, 1957, Box: 243, Item: 10. City Planning Department Library Collection, c.1910-2018 [bulk 1921-2004], RG-04-002. City of Pittsburgh Archives. https://pittsburghcityarchives.libraryhost.com/repositories/2/archival_objects/28684 Accessed April 18, 2025.