Texas. Advisory Commission on State Emergency Communications. 9-1-1 Caller, Volume 5, Number 3, May/June 1993, periodical, May 1993; (https://texashistory.unt.edu/ark:/67531/metapth1203523/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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