Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-D". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Spur No. 57". Highway Designation Files. Texas Department of Transportation. Retrieved June 5, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-E". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Spur No. 268". Highway Designation Files. Texas Department of Transportation. Retrieved June 6, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Spur No. 269". Highway Designation Files. Texas Department of Transportation. Retrieved June 6, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 546". Highway Designation Files. Texas Department of Transportation. Retrieved June 6, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-F". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 214". Highway Designation Files. Texas Department of Transportation. Retrieved June 12, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-G". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 402". Highway Designation Files. Texas Department of Transportation. Retrieved July 10, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-H". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 333". Highway Designation Files. Texas Department of Transportation. Retrieved July 10, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-J". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 377". Highway Designation Files. Texas Department of Transportation. Retrieved July 12, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-K". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 316". Highway Designation Files. Texas Department of Transportation. Retrieved July 10, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Spur No. 316". Highway Designation Files. Texas Department of Transportation. Retrieved October 6, 2017.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-L". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 237". Highway Designation Files. Texas Department of Transportation. Retrieved July 11, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-M". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 432". Highway Designation Files. Texas Department of Transportation. Retrieved July 11, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-N". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 319". Highway Designation Files. Texas Department of Transportation. Retrieved July 11, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-P". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-Q". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 320". Highway Designation Files. Texas Department of Transportation. Retrieved July 11, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-R". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 355". Highway Designation Files. Texas Department of Transportation. Retrieved July 12, 2010.
Transportation Planning and Programming Division (n.d.). "Business Interstate Highway No. 20-T". Highway Designation Files. Texas Department of Transportation. Retrieved May 30, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Loop No. 425". Highway Designation Files. Texas Department of Transportation. Retrieved July 12, 2010.
Transportation Planning and Programming Division (n.d.). "State Highway Spur No. 425". Highway Designation Files. Texas Department of Transportation. Retrieved October 8, 2017.