Texas. Department of State Health Services. Texas EMS Magazine, Volume 17, Number 3, May/June 1996, periodical, May 1996; (https://texashistory.unt.edu/ark:/67531/metapth1507922/m1/40/: accessed July 11, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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