Texas. Department of State Health Services. Texas EMS Magazine, Volume 33, Number 5, September/October 2012, periodical, September 2012; (https://texashistory.unt.edu/ark:/67531/metapth541931/m1/3/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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