Interstate 79 (English Wikipedia)

Grata, Joe (March 31, 1991). "PennDOT to Restrict I-79 Lanes This Year". Road Report. The Pittsburgh Press. p. A14 – via Google News Archive Search.

newspapers.com

"Interstates Renumbered". The Pittsburgh Press. February 24, 1972. p. 8. Retrieved November 30, 2017 – via Newspapers.com.

"Pennsylvania Exit Numbering" (PDF). Pennsylvania Department of Transportation. Retrieved October 2, 2007.

Panuska, Mallory (December 22, 2010). "Gateway Connector opens today". Times West Virginian. Fairmont, West Virginia. Retrieved December 22, 2010.

Public Roads Administration (August 14, 1957). Official Route Numbering for the National System of Interstate and Defense Highways, as adopted by the American Association of State Highway Officials (Map). Scale not given. Washington, DC: Public Roads Administration – via Wikimedia Commons.
Bureau of Public Roads (September 1955). "Erie" (Map). General Location of National System of Interstate Highways Including All Additional Routes at Urban Areas Designated in September 1955. Scale not given. Washington, DC: Government Printing Office. p. 74. OCLC 4165975 – via Wikimedia Commons.
Bureau of Public Roads (June 27, 1958). Official Route Numbering for the National System of Interstate and Defense Highways, as adopted by the American Association of State Highway Officials (Map). Scale not given. Washington, DC: Bureau of Public Roads – via Wikimedia Commons.

Bureau of Public Roads (September 1955). "Pittsburgh and environs" (Map). General Location of National System of Interstate Highways Including All Additional Routes at Urban Areas Designated in September 1955. Scale not given. Washington, DC: Government Printing Office. p. 77. OCLC 4165975 – via Wikimedia Commons.

Bureau of Public Roads (September 1955). "Erie" (Map). General Location of National System of Interstate Highways Including All Additional Routes at Urban Areas Designated in September 1955. Scale not given. Washington, DC: Government Printing Office. p. 74. OCLC 4165975 – via Wikimedia Commons.
Bureau of Public Roads (September 1955). "Pittsburgh and environs" (Map). General Location of National System of Interstate Highways Including All Additional Routes at Urban Areas Designated in September 1955. Scale not given. Washington, DC: Government Printing Office. p. 77. OCLC 4165975 – via Wikimedia Commons.