Interstate 20 (English Wikipedia)

Robert Malme. "Interstate 20 in North Carolina?". I-73/I-74 in North Carolina. Archived from the original on February 25, 2012. Retrieved July 7, 2009.

ghostarchive.org (Global: 64^th place; English: 28^th place)

"Strategic Highway Corridors Vision Plan" (PDF). Strategic Highway Corridors. NCDOT. July 10, 2008. Archived (PDF) from the original on October 9, 2022. Retrieved July 7, 2009.
"Strategic Highway Corridors Vision Plan, Southeastern NC" (PDF). Strategic Highway Corridors. NCDOT. September 2, 2004. Archived (PDF) from the original on October 9, 2022. Retrieved July 7, 2009.

"Interstate exit signs to get new numbers in Georgia". Jacksonville.com. Archived from the original on August 8, 2017. Retrieved January 17, 2015.

Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.

"Strategic Highway Corridors". NCDOT. Archived from the original on February 22, 2012. Retrieved July 7, 2009.
"Strategic Highway Corridors Vision Plan" (PDF). Strategic Highway Corridors. NCDOT. July 10, 2008. Archived (PDF) from the original on October 9, 2022. Retrieved July 7, 2009.
"Strategic Highway Corridors Vision Plan, Southeastern NC" (PDF). Strategic Highway Corridors. NCDOT. September 2, 2004. Archived (PDF) from the original on October 9, 2022. Retrieved July 7, 2009.

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). Washington, DC: Public Roads Administration. Archived from the original on July 19, 2017. Retrieved June 14, 2018 – via Wikimedia Commons.
"Interstate exit signs to get new numbers in Georgia". Jacksonville.com. Archived from the original on August 8, 2017. Retrieved January 17, 2015.
Robert Malme. "Interstate 20 in North Carolina?". I-73/I-74 in North Carolina. Archived from the original on February 25, 2012. Retrieved July 7, 2009.
"Strategic Highway Corridors". NCDOT. Archived from the original on February 22, 2012. Retrieved July 7, 2009.