Houston-Galveston Area Council. Status of freeway and expressway system: Houston-Galveston Region, January 1, 1991., map, 1991; (https://texashistory.unt.edu/ark:/67531/metapth190696/m1/1/: accessed June 28, 2022), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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