Interstate 99 (English Wikipedia)

Bock, Greg (November 25, 2008). "Long road for I-99 comes to end". Altoona Mirror. Retrieved July 18, 2010.
Bock, Greg (December 18, 2007). "Long-awaited I-99 stretch opens". Altoona Mirror. Retrieved July 19, 2010.

arc.gov (Global: low place; English: low place)

"Status of the Appalachian Development Highway System as of September 30, 2009" (PDF). Appalachian Regional Commission. December 2009. Archived from the original (PDF) on October 5, 2010. Retrieved July 18, 2010.

binged.it (Global: low place; English: low place)

Microsoft; Nokia. "overview map of Interstate 99 in New York" (Map). Bing Maps. Microsoft. Retrieved July 24, 2012.

centredaily.com (Global: low place; English: 9,015^th place)

Kines, Halie (November 11, 2022). "After a 'long road,' the first phase of the Jacksonville Road project is open in Centre County". Centre Daily Times. Retrieved November 15, 2022.

dot.gov (Global: 1,690^th place; English: 998^th place)

fhwa.dot.gov

Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 21, 2023.

gpo.gov (Global: 1,360^th place; English: 845^th place)

"National Highway System Designation Act of 1995". Retrieved June 23, 2014.

grmims.com (Global: low place; English: low place)

grmservices.grmims.com

Special Committee on U.S. Route Numbering (October 30, 2024). "2024 Annual Meeting Report to the Council on Highways and Streets" (Report). Washington, DC: American Association of State Highway and Transportation Officials. Retrieved November 12, 2024 – via AASHTO Route Numbering Archive.

loc.gov (Global: 70^th place; English: 63^rd place)

thomas.loc.gov

"Bill Summary & Status H.R.2950". Archived from the original on December 15, 2012. Retrieved June 23, 2014.
"Bill Text H.R.2950". Retrieved June 23, 2014.^{[permanent dead link]}

m-plex.com (Global: low place; English: low place)

"US 15/Future I-99 Multiplex - Central PA/MD Roads". www.m-plex.com. Retrieved January 13, 2019.

maps.google.com (Global: 2,258^th place; English: 1,630^th place)

"Overview Map of I-99" (Map). Google Maps. Retrieved July 18, 2010.

ny.gov (Global: 1,775^th place; English: 970^th place)

dot.ny.gov

"Steuben County Inventory Listing". New York State Department of Transportation. October 1, 2009. Archived from the original (CSV) on April 8, 2013. Retrieved January 17, 2010.

nytimes.com (Global: 7^th place; English: 7^th place)

Hamill, Sean D. (December 27, 2008). "Road Stirs Up Debate, Even on Its Name". The New York Times.

pahighways.com (Global: low place; English: low place)

Kitsko, Jeffrey J. (2011). "U.S. Route 15". Pennsylvania Highways. Retrieved February 25, 2013.^{[unreliable source]}

post-gazette.com (Global: 569^th place; English: 354^th place)

Gibb, Tom (December 7, 2002). "I-99 segment gets environmental OK". Pittsburgh Post-Gazette. Retrieved July 19, 2010.

stargazette.com (Global: low place; English: low place)

[Staff writer] (June 28, 2014). "Corning Area Now Has 2 Interstates: US 15 Designated I-99 to Pa. Border". Star-Gazette. Archived from the original on July 15, 2014. Retrieved June 28, 2014.

statecollege.com (Global: low place; English: low place)

"PennDOT Details New Local Access Tied to I-80/I-99 Interchange Project". Centre County Gazette. March 1, 2019. Archived from the original on March 1, 2019. Retrieved March 2, 2019.
"Next Phases of I-80/I-99 High Speed Interchange Project to Begin This Year". StateCollege.com. April 18, 2024. Retrieved June 5, 2024.

tiogapublishing.com (Global: low place; English: low place)

"Route 15 southbound lanes opened". The Wellsboro Gazette. November 18, 2009. Retrieved February 25, 2013.

transportation.org (Global: low place; English: low place)

cms.transportation.org

"Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF). American Association of State Highway and Transportation Officials. November 7, 1998. Archived from the original (PDF) on October 12, 2006. Retrieved July 18, 2010.
"Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF). American Association of State Highway and Transportation Officials. May 31, 2003. Archived from the original (PDF) on February 4, 2007. Retrieved July 18, 2010.

web.archive.org (Global: 1^st place; English: 1^st place)

"Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF). American Association of State Highway and Transportation Officials. November 7, 1998. Archived from the original (PDF) on October 12, 2006. Retrieved July 18, 2010.
[Staff writer] (June 28, 2014). "Corning Area Now Has 2 Interstates: US 15 Designated I-99 to Pa. Border". Star-Gazette. Archived from the original on July 15, 2014. Retrieved June 28, 2014.
"Status of the Appalachian Development Highway System as of September 30, 2009" (PDF). Appalachian Regional Commission. December 2009. Archived from the original (PDF) on October 5, 2010. Retrieved July 18, 2010.
"Bill Summary & Status H.R.2950". Archived from the original on December 15, 2012. Retrieved June 23, 2014.
"Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF). American Association of State Highway and Transportation Officials. May 31, 2003. Archived from the original (PDF) on February 4, 2007. Retrieved July 18, 2010.
"PennDOT Details New Local Access Tied to I-80/I-99 Interchange Project". Centre County Gazette. March 1, 2019. Archived from the original on March 1, 2019. Retrieved March 2, 2019.
"Steuben County Inventory Listing". New York State Department of Transportation. October 1, 2009. Archived from the original (CSV) on April 8, 2013. Retrieved January 17, 2010.

wjactv.com (Global: low place; English: low place)

Sinderson, Gary (November 10, 2022). "First phase of Interstate 99/I-80 interchange project complete". WJAC. Retrieved May 5, 2023.

Interstate 99 (English Wikipedia)

altoonamirror.com (Global: low place; English: low place)

arc.gov (Global: low place; English: low place)

binged.it (Global: low place; English: low place)

centredaily.com (Global: low place; English: 9,015th place)

dot.gov (Global: 1,690th place; English: 998th place)

fhwa.dot.gov

gpo.gov (Global: 1,360th place; English: 845th place)

grmims.com (Global: low place; English: low place)

grmservices.grmims.com

loc.gov (Global: 70th place; English: 63rd place)

thomas.loc.gov

m-plex.com (Global: low place; English: low place)

maps.google.com (Global: 2,258th place; English: 1,630th place)

ny.gov (Global: 1,775th place; English: 970th place)

dot.ny.gov

nytimes.com (Global: 7th place; English: 7th place)

pahighways.com (Global: low place; English: low place)

post-gazette.com (Global: 569th place; English: 354th place)

stargazette.com (Global: low place; English: low place)

statecollege.com (Global: low place; English: low place)

tiogapublishing.com (Global: low place; English: low place)

transportation.org (Global: low place; English: low place)

cms.transportation.org

web.archive.org (Global: 1st place; English: 1st place)

wjactv.com (Global: low place; English: low place)

centredaily.com (Global: low place; English: 9,015^th place)

dot.gov (Global: 1,690^th place; English: 998^th place)

gpo.gov (Global: 1,360^th place; English: 845^th place)

loc.gov (Global: 70^th place; English: 63^rd place)

maps.google.com (Global: 2,258^th place; English: 1,630^th place)

ny.gov (Global: 1,775^th place; English: 970^th place)

nytimes.com (Global: 7^th place; English: 7^th place)

post-gazette.com (Global: 569^th place; English: 354^th place)

web.archive.org (Global: 1^st place; English: 1^st place)